Add go-template and yaml formatters

[flimzy]

No description provided.

[codecov]

Codecov Report

Merging #44 into master will increase coverage by 0.31%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #44      +/-   ##
==========================================
+ Coverage   67.89%   68.21%   +0.31%     
==========================================
  Files           8        8              
  Lines         598      604       +6     
==========================================
+ Hits          406      412       +6     
  Misses        162      162              
  Partials       30       30              

Impacted Files	Coverage Δ
cmd/kouchctl/cmd/root.go	88.46% <100.00%> (+1.50%)	⬆️

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