Release of 3.2.0

Release of v2.7.1

* fix runtime exception when there is no controller passed in

Release of 2.7.0

add new configuration `disableDefaultTabController`

Release of v3.0.0-nullsafety.0

Migrate to null-safety

Release of v2.6.0

1. Fix tab highlight state to satisfy keyboard and router case;
2. Breaking changes: disable initial index property when working with TabController to avoid potential index conflict;

Release of v2.5.1

Release of v2.5.0

* Support hook api for tab event. [how-to-block-tab-event?](https://github.com/hacktons/convex_bottom_bar/blob/master/doc/how-to-block-tab-event.md)

Release of v2.4.1

Fix badge alignment issues [#77](#77).

Relase of v2.4.0

* Support flutter v1.20, the v2.2.4-flutter-1.20 is now sync with v2.4.0.
* Add new feature. We can now add corner on AppBars's background.

Release of v2.3.0

* Add button widget;