Add support for getting commits of line range

[SalmonMode]

Closes #60

I had to tweak a variable name because TS was complaining. Also several tests are failing, but I don't think it's because of what I did.

[hipstersmoothie]

Could you rebase? I reverted the PR that broke all the tests

[SalmonMode]

@hipstersmoothie Thanks! I rebased, added a test, and also modified a few of the tests a little bit just to speed the tests up a little (they were all calling gitlog the same way, and none modify the results, so it's safe).

[hipstersmoothie]

Awesome! Running the tests locally though it looks like one of them doesn't pass

 ✕ returns C100 status for files that are copied (1535ms)

[SalmonMode]

hmmmm it's passing for me. I also ran the create repo script and ran the commands myself, and it seems to be working.

The command it came up with for that one was this for me:

git log --find-copies-harder -n 10 --pretty="@begin@        %h      %H      %s      %an     %ai@end@" --name-status

I also confirmed with a similar test (returns A status for files that are added), which produces this command

git log -n 10 --pretty="@begin@     %h      %H      %s      %an     %ai@end@" --name-status

and when I ran that myself, I saw the A in place of the C100 from the previous test's command.

[hipstersmoothie]

🚀 PR was released in v4.0.2 🚀