Bump httplib2 from 0.18.0 to 0.19.0 in /requirements
Bump httplib2 from 0.18.0 to 0.19.0 in /requirements

Bumps [httplib2](https://github.com/httplib2/httplib2) from 0.18.0 to 0.19.0.
- [Release notes](https://github.com/httplib2/httplib2/releases)
- [Changelog](https://github.com/httplib2/httplib2/blob/master/CHANGELOG)
- [Commits](https://github.com/httplib2/httplib2/compare/v0.18.0...v0.19.0)

---
updated-dependencies:
- dependency-name: httplib2
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
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