feat: remove revert commits from changelog

[KennethTrecy]

Closes #11

This PR slightly modifies parseGitCommit() and related types to extract the commits that has been reverted. Then, filterCommits() removes the commits that revert others or has been reverted. However, the commit that does the reversion, and the commits that would be reverted should be in the current version only. See the following scenarios below.

For example, we have the following log:

abc123 (tag: v1.1.0) chore: fifth commit (reverts def456)
cba123 chore: fourth commit
def456 chore: third commit
fed456 (tag: v1.0.0) chore: second commit
abc789 chore: first commit

In this example, commit abc123 reverts the commit def456. Therefore, both of them would not be present in the resulting change log set. Only the fourth commit would show.

However, if a commit reverts a commit from previous version, it would not remove it.

abc123 (tag: v1.1.0) chore: fifth commit 
cba123 chore: fourth commit (reverts abc789)
def456 chore: third commit
fed456 (tag: v1.0.0) chore: second commit
abc789 chore: first commit

In this second example, third, fourth, and fifth commit would be shown in the change log set.

I added tests to ensure the implementation is working. Let me know if there is something I could improve in this PR. Thank you.

[codecov]

Codecov Report

Merging #65 (805d93d) into main (1b5fa2d) will increase coverage by 14.20%.
The diff coverage is 97.01%.

❗ Current head 805d93d differs from pull request most recent head c3652ac. Consider uploading reports for the commit c3652ac to get more accurate results

@@             Coverage Diff             @@
##             main      #65       +/-   ##
===========================================
+ Coverage   68.63%   82.84%   +14.20%     
===========================================
  Files           9        5        -4     
  Lines         880      542      -338     
  Branches       81       78        -3     
===========================================
- Hits          604      449      -155     
+ Misses        276       93      -183     

Impacted Files	Coverage Δ
src/git.ts	90.00% <97.01%> (+6.23%)	⬆️

... and 8 files with indirect coverage changes