Basic "get" support

[flimzy]

No description provided.

[codecov]

Codecov Report

Merging #43 into master will decrease coverage by 0.45%.
The diff coverage is 63.33%.

@@            Coverage Diff             @@
##           master      #43      +/-   ##
==========================================
- Coverage   69.01%   68.56%   -0.46%     
==========================================
  Files           8        8              
  Lines         568      598      +30     
==========================================
+ Hits          392      410      +18     
- Misses        146      158      +12     
  Partials       30       30              

Impacted Files	Coverage Δ
cmd/kouchctl/config/config.go	80.53% <23.52%> (-7.06%)	⬇️
cmd/kouchctl/errors/errors.go	47.82% <60.86%> (+10.32%)	⬆️
cmd/kouchctl/cmd/get.go	91.30% <100.00%> (-8.70%)	⬇️
cmd/kouchctl/cmd/ping.go	92.30% <100.00%> (ø)
cmd/kouchctl/cmd/root.go	86.95% <100.00%> (+6.18%)	⬆️
replicate.go	63.87% <0.00%> (+0.88%)	⬆️

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