Preparation for 3.0.0 release (#578)

- Change the groupId in preparation to google maven
- Update the README accordingly
- Update the dependent library versions
- Remove the obsolete plugins for publishing to maven
- Introduced maven pubilsher plugin (https://developer.android.com/studio/build/maven-publish-plugin) instead

Prepare for 2.0.1 release (#533)

Preparation for 2.0.0 (#518)

Update README

Version bump for 1.1.1 release (#510)

Merge pull request #461 from google/update_build_gradle_version_3.2

Merge the androidx to master

Bump versions for the 1.1.0-beta1 release (#447)

Bump the version. (#429)

flexbox-layout has been considered as stable for a while, but from this
on, it starts to follow the semantic versioning.

Bump up the library version

Bump up the version to 0.3.1

Bump the version to 0.3.0. (#324)

For a stable release including RecyclerView integration:
- Bump the library version.
- Update the README