(#31) --since filter

[llorllale]

PR for #31:

• --since filter
• puzzle for removing issues.Filters()

[codecov]

Codecov Report

Merging #33 into master will decrease coverage by 0.39%.
The diff coverage is 81.81%.

@@            Coverage Diff            @@
##           master      #33     +/-   ##
=========================================
- Coverage   85.71%   85.32%   -0.4%     
=========================================
  Files           4        4             
  Lines          98      109     +11     
=========================================
+ Hits           84       93      +9     
- Misses          7        8      +1     
- Partials        7        8      +1

Impacted Files	Coverage Δ
internal/issues/filters.go	89.74% <ø> (ø)	⬆️
internal/commits/commits.go	86.36% <81.81%> (-1.52%)	⬇️

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