Bump git2 from 0.13.12 to 0.15.0

[dependabot[bot]]

Bumps git2 from 0.13.12 to 0.15.0.

Commits

• d703dd9 Update to 1.4.2 (#815)
• 8c6a26b Merge pull request #814 from weihanglo/git2-curl-0.15.0
• ce54dac Bump version of git2-curl
• 64d849b Update to 1.4.1 (#811)
• af6fc41 Bump libgit2 in version probe and readme (#808)
• 509fe58 Bump libgit2 to 1.4.0 (#806)
• 58ed9c3 libgit2-sys: use src instead .git as vendored indicator (#801)
• ae02afd Harmonize commitish and committish in docstrings (#799)
• 74fd960 Fix typo in DiffFindOptions (#798)
• c55bd6d Add support for custom git extensions (#791)
• Additional commits viewable in compare view

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