Bump libgit2-sys from 0.16.1+1.7.1 to 0.16.2+1.7.2 (#111)

Bumps [libgit2-sys](https://github.com/rust-lang/git2-rs) from 0.16.1+1.7.1 to 0.16.2+1.7.2.
- [Changelog](https://github.com/rust-lang/git2-rs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-lang/git2-rs/commits)

---
updated-dependencies:
- dependency-name: libgit2-sys
  dependency-type: indirect
...

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