Generic commit author emails used by bots omitted from checks with a regex pattern match

[tumaysem]

• exclude pattern argument added similar to exclude emails
• pattern checked against commit author email for omitting checks
• unit tests updated and pattern check included in email exclusion test
• README.md updated

fixes #123

[codecov[bot]]

Codecov Report

Merging #126 (5f9e18b) into master (723e4e2) will decrease coverage by 5.53%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #126      +/-   ##
==========================================
- Coverage   65.61%   60.07%   -5.54%     
==========================================
  Files           2        2              
  Lines         506      516      +10     
  Branches       98      100       +2     
==========================================
- Hits          332      310      -22     
- Misses        150      184      +34     
+ Partials       24       22       -2     

Impacted Files	Coverage Δ
dco_check/dco_check.py	59.92% <100.00%> (-5.56%)	:arrow_down:

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[christophebedard]

Released as 0.4.0: https://github.com/christophebedard/dco-check/releases/tag/0.4.0