Release 1.4.6
Release 1.4.6

Release includes:
  * GUI fix.
  * Code refactoring and optimization.
  * Remove change notes from `plugin.xml` as they are published on github releases.

Reviewed at https://rbcommons.com/s/twitter/r/4185/

wisechengyi/intellij-pants-plugin,wisechengyi/intellij-pants-plugin,wisechengyi/intellij-pants-plugin,pantsbuild/intellij-pants-plugin,pantsbuild/intellij-pants-plugin,pantsbuild/intellij-pants-plugin,wisechengyi/intellij-pants-plugin,pantsbuild/intellij-pants-plugin,pantsbuild/intellij-pants-plugin