google-oauth2-easy-0.0.0: CHANGELOG.md

# Change log

google-oauth2-easy uses [Semantic Versioning][].
The change log is available through the [releases on GitHub][].

[Semantic Versioning]: http://semver.org/spec/v2.0.0.html
[releases on GitHub]: https://github.com/githubuser/google-oauth2-easy/releases