Avoid most approval subtractions #43
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According to NixOS/nixpkgs#388953 (comment), it is currently not possible to do code change comparisons, so there's not much we can do about #22.
This PR is a PoC workaround, which now removes approval labels only if the pull request was updated with a higher approval label after a force push, while no new approval was given. There are no plans to merge this PR, as it presents a breaking change from the original behavior of the program.