Move login out of CLI

[hipstersmoothie]

What Changed

closes #31

Why

Enabling more reusage of code

Todo:

• Add tests
• Add docs
• Add SemVer label

[codecov]

Codecov Report

Merging #33 into master will increase coverage by 0.51%.
The diff coverage is 56.59%.

@@            Coverage Diff             @@
##           master      #33      +/-   ##
==========================================
+ Coverage   80.46%   80.97%   +0.51%     
==========================================
  Files          11       12       +1     
  Lines         778      778              
  Branches      104      103       -1     
==========================================
+ Hits          626      630       +4     
+ Misses        137      131       -6     
- Partials       15       17       +2

Impacted Files	Coverage Δ
src/log-parse.ts	93.61% <ø> (ø)	⬆️
src/git.ts	99.25% <ø> (ø)	⬆️
src/bin/auto.ts	0% <0%> (-19.52%)	⬇️
src/main.ts	22.78% <21.79%> (-71.89%)	⬇️
src/github-release.ts	94.66% <94.66%> (ø)

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