Uppercase Git

It's [debatable](https://github.com/git/git/commit/e83c5163316f89bfbde7d9ab23ca2e25604af290#diff-c47c7c7383225ab55ff591cb59c41e6bR1) whether it's spelled Git, GIT, or "git", we default to Git. But yeah, ultimately I'm just being pedantic here... :trollface: