optimized_gesture_detector 0.0.6

a optimized class on flutter GestureDector

[0.0.6] - 20200918

• Update to Flutter breaking change, VelocityTracker now takes an argument.
• Removed unused import.
• Version 0.0.5 is for Flutter pre 1.22 and Version 0.0.6 is for 1.22 and later.

[0.0.5] - 20200606

• use GestureArenaTeam too help scale gesture recognizer resolve gesture conflict

[0.0.4] - 20200529

• add gestures for use gesture arena

[0.0.3] - 20200228

• Add LICENSE file.

[0.0.2] - 20191219

• when write this project(https://github.com/SunPointed/MPFlutterChart), find flutter GestureDetector
• doesn't work well for support zoom just x or y direction, so write this class for better support
• user's touch