fix: filter out comment messege when checking

[yuukidach]

fix #455

Description

Currently cz check will also check comment in git commit message (mentioned in issue #455). This PR add a filter to remove those comment lines in git commit message.

Checklist

• Add test cases to all the changes you introduce
• Run ./script/format and ./script/test locally to ensure this change passes linter check and test
• Test the changes on the local machine manually
• Update the documentation for the changes

Expected behavior

Comment in git commit message will be ignored.

Steps to Test This Pull Request

1. Create a commit message file with comments in it (see cz check does not ignore comments #455)
2. Run cz check --commit-msg-file <just_created_file>

Additional context

[codecov]

Codecov Report

Merging #462 (ba1afeb) into master (48f9b7e) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #462   +/-   ##
=======================================
  Coverage   97.96%   97.97%           
=======================================
  Files          39       39           
  Lines        1424     1431    +7     
=======================================
+ Hits         1395     1402    +7     
  Misses         29       29           

Flag	Coverage Δ
unittests	97.97% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
commitizen/__version__.py	100.00% <100.00%> (ø)
commitizen/commands/check.py	100.00% <100.00%> (ø)

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[Lee-W]

@yuukidach Thanks for your contribution! @woile I'm good with this feature. Could you please check? Thanks!

[woile]

LGTM