add note on breaking change
## [0.10.0] - Unreleased
### Changes
+- BREAKING: App::wait() returns bool instead of Result since it doesn't error out.
- Add WidgetExt::draw2(), WidgetExt::handle2() and TableExt::draw_cell2() all of which expose the widget in the closure arguments.
- Remove the requirement to box callbacks.
- Passing CString to C/C++ should not panic on inner null characters.
-- App::wait() returns bool instead of Result since it doesn't error out.
## [0.9.7] - 2020-10-20
### Changes
