flutter_selectext 0.0.4

Selectable text widget and able to set custom selection control.

[0.0.4] - 2019/04/28

• try to fix error for dart pub.

[0.0.3] - 2019/04/28

• add flutter for environment on pubspec.yaml

[0.0.2] - 2019/04/28

• do flutter format and delete unused class.

[0.0.1] - 2019/04/28

• publish.