(#52) Ignore authors by name and email

[llorllale]

For #52

Two new flags:

• excl-author-names: comma-separated list of regexes matched against names of authors.
• excl-author-emails: comma-separated list of regexes matched against emails of authors

If an authors name or email matches these then the commit will be excluded from the analysis.

[codecov]

Codecov Report

Merging #56 into master will decrease coverage by 0.31%.
The diff coverage is 85.36%.

@@            Coverage Diff             @@
##           master      #56      +/-   ##
==========================================
- Coverage   86.56%   86.25%   -0.32%     
==========================================
  Files           4        4              
  Lines         134      160      +26     
==========================================
+ Hits          116      138      +22     
- Misses          9       11       +2     
- Partials        9       11       +2

Impacted Files	Coverage Δ
internal/commits/commits.go	86.36% <85.36%> (-0.74%)	⬇️

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