(#12) Split commit message subject and body

[llorllale]

This PR is for #12:

• now splitting a commit's message's body from the subject using \n\n as separator

[codecov]

Codecov Report

Merging #13 into master will increase coverage by 3.22%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #13      +/-   ##
==========================================
+ Coverage   81.39%   84.61%   +3.22%     
==========================================
  Files           2        2              
  Lines          43       52       +9     
==========================================
+ Hits           35       44       +9     
  Misses          4        4              
  Partials        4        4

Impacted Files	Coverage Δ
internal/commits/commits.go	86.95% <100%> (+3.17%)	⬆️

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