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The previous implementarion use onTapDown to start dragging instead of the events "onHorizontalDragStart" and "onVerticalDragStart" provided by GestureDetector.
Using onTapDown might confuse users because it requires a few seconds before actually starting the drag and drop event which is not the expected behavior (#18).
This pull request also fix lint issues according to new Flutter and Dart rules (https://medium.com/dartlang/announcing-dart-2-14-b48b9bb2fb67);