Bump google-apis-core from 0.2.0 to 0.2.1
Bump google-apis-core from 0.2.0 to 0.2.1

Bumps [google-apis-core](https://github.com/googleapis/google-api-ruby-client) from 0.2.0 to 0.2.1.
- [Release notes](https://github.com/googleapis/google-api-ruby-client/releases)
- [Changelog](https://github.com/googleapis/google-api-ruby-client/blob/master/google-apis-core/CHANGELOG.md)
- [Commits](https://github.com/googleapis/google-api-ruby-client/compare/google-apis-core/v0.2.0...google-apis-core/v0.2.1)

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