keframe 2.0.4

Helps you improve the fluency of Flutter's app for any scenario

[1.0.1] - before null-safe version

[1.0.2] - fix widget doesn't transform

[1.0.3] - remove unnecessary task

[2.0.0] - adapter null-safe version

[2.0.1] - modify notification usage

[2.0.2] - fix widget doesn't transform

[2.0.3] - remove unnecessary task

[2.0.4] - improve code style