Reduce dependencies

[tydavis]

• Simplify home directory detection, still without the need for cgo. Remove import.
• Fix typo
• Undo a mistake where goimports removed a library that was used in the file

[codecov]

Codecov Report

Merging #161 into master will decrease coverage by 0.03%.
The diff coverage is 75%.

@@            Coverage Diff             @@
##           master     #161      +/-   ##
==========================================
- Coverage   76.31%   76.27%   -0.04%     
==========================================
  Files          36       36              
  Lines        1579     1585       +6     
==========================================
+ Hits         1205     1209       +4     
- Misses        261      263       +2     
  Partials      113      113

Impacted Files	Coverage Δ
internal/git/git.go	77.95% <ø> (ø)	⬆️
main.go	68.42% <75%> (-0.33%)	⬇️

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[zaquestion]

I think there should be some gopkg.lock changes to seal the deal? I might be using this in another spot. intenal/config possibly