Merge pull request #86 from hello-robot/bugfix/aruco_detector_node

cv2 aruco api changes in detect_aruco_markers node

stretch_core/nodes/detect_aruco_markers

@@ -511,8 +511,8 @@ class ArucoMarkerCollection:
         self.show_debug_images = show_debug_images
         
         self.marker_info = marker_info
-        self.aruco_dict = aruco.Dictionary_get(aruco.DICT_6X6_250)
-        self.aruco_detection_parameters =  aruco.DetectorParameters_create()
+        self.aruco_dict = aruco.getPredefinedDictionary(aruco.DICT_6X6_250)
+        self.aruco_detection_parameters = aruco.DetectorParameters()
         # Apparently available in OpenCV 3.4.1, but not OpenCV 3.2.0.
         self.aruco_detection_parameters.cornerRefinementMethod = aruco.CORNER_REFINE_SUBPIX
         self.aruco_detection_parameters.cornerRefinementWinSize = 2