Merge pull request Baseflow#522 from Baseflow/equality

Upgrade to permission_handler_platform_interface 3.1.3

Merge pull request Baseflow#521 from Baseflow/update_changelog

Fixed typos

Merge pull request Baseflow#513 from Baseflow/issue/43_platform_inter…

…face

Allow checking serviceStatus for notification permission

Merge pull request Baseflow#490 from Baseflow/implementing_test_permi…

…ssion_handler

Added test

Merge pull request Baseflow#485 from Baseflow/implementing_tests

Added tests

Merge branch 'develop'

Merge branch 'develop'

Merge branch 'develop'

Merge branch 'develop'

Merge pull request Baseflow#460 from Baseflow/remove_undetermined

Removed PermissionStatus.undetermined