feat: skip merge messages that start with Pull request

[manang]

Bitbucket add as default message when a pull request is merged, the message commit that starts with "Pull request". cz check fails with this kind of messages.

Signed-off-by: Angelo Mantellini manangel@cisco.com

Description

Bitbucket add as default message when a pull request is merged, the message commit that starts with "Pull request". cz check fails with this kind of messages.

Checklist

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

Expected behavior

Steps to Test This Pull Request

1. create commit that starts with "Pull request"
2. cz check

[codecov]

Codecov Report

Merging #487 (bc9be40) into master (e6f1dc3) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #487   +/-   ##
=======================================
  Coverage   98.05%   98.05%           
=======================================
  Files          39       39           
  Lines        1441     1441           
=======================================
  Hits         1413     1413           
  Misses         28       28           

Flag	Coverage Δ
unittests	98.05% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

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

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