Bumps [httplib2](https://github.com/httplib2/httplib2) from 0.9.2 to 0.18.0.
- [Release notes](https://github.com/httplib2/httplib2/releases)
- [Changelog](https://github.com/httplib2/httplib2/blob/master/CHANGELOG)
- [Commits](https://github.com/httplib2/httplib2/compare/0.9.2...v0.18.0)

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Co-authored-by: Yann Bertrand <5855339+yannbertrand@users.noreply.github.com>

Combining PRs #728 and #741.

This avoids an IndexError if the length of split segments is shorter than expected.

every entry in this project is an API, so specifying adds nothing
meaningful

the branch logic lives in main.sh, so no need to check again

Will include link validation for pull requests in upcming addition