* Improve README

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update CONTRIBUTING.md

* Update CONTRIBUTING.md

* Update CONTRIBUTING.md

* Update CONTRIBUTING.md

Bumps [tzinfo-data](https://github.com/tzinfo/tzinfo-data) from 1.2018.5 to 1.2018.6.
- [Release notes](https://github.com/tzinfo/tzinfo-data/releases)
- [Commits](https://github.com/tzinfo/tzinfo-data/compare/v1.2018.5...v1.2018.6)

Signed-off-by: dependabot[bot] <support@dependabot.com>

* Use Ruby 2.5.2

* Specify 2.5.2p104 as RUBY VERSION

Heorku refers to RUBY VERSION in Gemfile.lock

* Use ruby-2.5.3

* Do not show "limited" visibility in default visibility preference

Fix regression from #8950

* Fix code style issue

* Add silent column to mentions

* Save silent mentions in ActivityPub Create handler and optimize it

Move networking calls out of the database transaction

* Add "limited" visibility level masked as "private" in the API

Unlike DMs, limited statuses are pushed into home feeds. The access
control rules between direct and limited statuses is almost the same,
except for counter and conversation logic

* Ensure silent column is non-null, add spec

* Ensure filters don't check silent mentions for blocks/mutes

As those are "this person is also allowed to see" rather than "this
person is involved", therefore does not warrant filtering

* Clean up code

* Use Status#active_mentions to limit returned mentions

* Fix code style issues

* Use Status#active_mentions in Notification

And remove stream_entry eager-loading from Notification

Bumps [oj](https://github.com/ohler55/oj) from 3.6.11 to 3.6.12.
- [Release notes](https://github.com/ohler55/oj/releases)
- [Changelog](https://github.com/ohler55/oj/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ohler55/oj/compare/v3.6.11...v3.6.12)

Signed-off-by: dependabot[bot] <support@dependabot.com>

This fixes hotkeys not working when pressing the column
“back” button, for instance.

Includes Japanese and English

* fix finnish locale variable issue

* fix broken welsh localized string

In german one female user is "Benutzerin" not "Benutzerinnen"

Regression from #8569

Bumps [strong_migrations](https://github.com/ankane/strong_migrations) from 0.2.3 to 0.3.0.
- [Release notes](https://github.com/ankane/strong_migrations/releases)
- [Changelog](https://github.com/ankane/strong_migrations/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ankane/strong_migrations/compare/v0.2.3...v0.3.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

* Update issue templates

* Update bug_report.md

* Update feature_request.md

* Update support.md

* Update feature_request.md

Fixes #783

* fix invites in italian language

* fix invites in italian language

Fixes #780

* Translated using Weblate (Welsh)

Currently translated at 64.4% (448 of 696 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/cy/

* Translated using Weblate (Arabic)

Currently translated at 98.0% (682 of 696 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/ar/

* Translated using Weblate (French)

Currently translated at 99.9% (695 of 696 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/fr/

* Translated using Weblate (Arabic)

Currently translated at 94.3% (82 of 87 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/ar/

* Translated using Weblate (Welsh)

Currently translated at 88.7% (297 of 335 strings)

Translation: Mastodon/React
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/frontend/cy/

* Translated using Weblate (French)

Currently translated at 100.0% (335 of 335 strings)

Translation: Mastodon/React
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/frontend/fr/

* Translated using Weblate (French)

Currently translated at 100,0% (87 of 87 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/fr/

* Translated using Weblate (Czech)

Currently translated at 100.0% (335 of 335 strings)

Translation: Mastodon/React
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/frontend/cs/

* Translated using Weblate (Czech)

Currently translated at 100.0% (87 of 87 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/cs/

* Translated using Weblate (Czech)

Currently translated at 99.9% (695 of 696 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/cs/

* Translated using Weblate (Persian)

Currently translated at 100.0% (335 of 335 strings)

Translation: Mastodon/React
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/frontend/fa/

* Translated using Weblate (Arabic)

Currently translated at 94.6% (88 of 93 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/ar/

* Translated using Weblate (Arabic)

Currently translated at 100.0% (335 of 335 strings)

Translation: Mastodon/React
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/frontend/ar/

* Translated using Weblate (Czech)

Currently translated at 100.0% (93 of 93 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/cs/

* Translated using Weblate (Galician)

Currently translated at 100,0% (93 of 93 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/gl/

* Translated using Weblate (Galician)

Currently translated at 100,0% (696 of 696 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/gl/

* Translated using Weblate (Greek)

Currently translated at 100.0% (93 of 93 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/el/

* Translated using Weblate (Greek)

Currently translated at 98.8% (331 of 335 strings)

Translation: Mastodon/React
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/frontend/el/

* Translated using Weblate (Greek)

Currently translated at 99.7% (694 of 696 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/el/

* Translated using Weblate (Persian)

Currently translated at 100.0% (93 of 93 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/fa/

* Translated using Weblate (Czech)

Currently translated at 99.9% (695 of 696 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/cs/

* Translated using Weblate (French)

Currently translated at 100,0% (93 of 93 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/fr/

* Translated using Weblate (French)

Currently translated at 99.9% (695 of 696 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/fr/

* Translated using Weblate (Japanese)

Currently translated at 99.4% (692 of 696 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/ja/

* Translated using Weblate (Corsican)

Currently translated at 100.0% (93 of 93 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/co/

* Translated using Weblate (Corsican)

Currently translated at 99.9% (695 of 696 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/co/

* Translated using Weblate (German)

Currently translated at 99.6% (693 of 696 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/de/

* Translated using Weblate (German)

Currently translated at 100,0% (93 of 93 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/de/

* Translated using Weblate (Japanese)

Currently translated at 99.4% (692 of 696 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/ja/

* Translated using Weblate (Japanese)

Currently translated at 99.9% (695 of 696 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/ja/

* Translated using Weblate (Japanese)

Currently translated at 100.0% (335 of 335 strings)

Translation: Mastodon/React
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/frontend/ja/

* Translated using Weblate (Japanese)

Currently translated at 94.6% (88 of 93 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/ja/

* i18n-tasks normalize

* yarn manage:translations

Fixes #778

Bumps [pundit](https://github.com/varvet/pundit) from 1.1.0 to 2.0.0.
- [Release notes](https://github.com/varvet/pundit/releases)
- [Changelog](https://github.com/varvet/pundit/blob/master/CHANGELOG.md)
- [Commits](https://github.com/varvet/pundit/compare/v1.1.0...v2.0.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Fixes #672

* Downcase signed_headers string before building the signed string

The HTTP Signatures draft does not mandate the “headers” field to be downcased,
but mandates the header field names to be downcased in the signed string, which
means that prior to this patch, Mastodon could fail to process signatures from
some compliant clients. It also means that it would not actually check the
Digest of non-compliant clients that wouldn't use a lowercased Digest field
name.

Thankfully, I don't know of any such client.

* Revert "Remove dead code (#8919)"

This reverts commit a00ce8c92c.

* Restore time window checking, change it to 12 hours

By checking the Date header, we can prevent replaying old vulnerable
signatures. The focus is to prevent replaying old vulnerable requests
from software that has been fixed in the meantime, so a somewhat long
window should be fine and accounts for timezone misconfiguration.

* Escape users' URLs when formatting them

Fixes possible HTML injection

* Escape all string interpolations in Formatter class

Slightly improve performance by reducing class allocations
from repeated Formatter#encode calls

* Fix code style issues

Follow-up to #8766

Regression from #8942

Regression from #8957

* Downcase signed_headers string before building the signed string

The HTTP Signatures draft does not mandate the “headers” field to be downcased,
but mandates the header field names to be downcased in the signed string, which
means that prior to this patch, Mastodon could fail to process signatures from
some compliant clients. It also means that it would not actually check the
Digest of non-compliant clients that wouldn't use a lowercased Digest field
name.

Thankfully, I don't know of any such client.

* Revert "Remove dead code (#8919)"

This reverts commit a00ce8c92c.

* Restore time window checking, change it to 12 hours

By checking the Date header, we can prevent replaying old vulnerable
signatures. The focus is to prevent replaying old vulnerable requests
from software that has been fixed in the meantime, so a somewhat long
window should be fine and accounts for timezone misconfiguration.

* Escape users' URLs when formatting them

Fixes possible HTML injection

* Escape all string interpolations in Formatter class

Slightly improve performance by reducing class allocations
from repeated Formatter#encode calls

* Fix code style issues

Merge upstream changes

* Set CSP rules in RoR's configuration

* Override CSP setting in the embed controller to allow frames

Bumps [doorkeeper](https://github.com/doorkeeper-gem/doorkeeper) from 5.0.0 to 5.0.1.
- [Release notes](https://github.com/doorkeeper-gem/doorkeeper/releases)
- [Changelog](https://github.com/doorkeeper-gem/doorkeeper/blob/master/NEWS.md)
- [Commits](https://github.com/doorkeeper-gem/doorkeeper/compare/v5.0.0...v5.0.1)

Signed-off-by: dependabot[bot] <support@dependabot.com>

* Add check for missing tag param in streaming API

Fixes error:

```
TypeError: Cannot read property 'toLowerCase' of undefined
at app.get (.../streaming/index.js:493:50)
```

* Fix code style issues

Regression from #8951