Support []byte in Value

[fizx]

This is a reduction of the longstanding #143 to do the minimum I actually need: letting me put []byte's into and out of values.

[codecov[bot]]

Codecov Report

Base: 95.28% // Head: 95.33% // Increases project coverage by +0.04% :tada:

Coverage data is based on head (aedc302) compared to base (7d843f1). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #356      +/-   ##
==========================================
+ Coverage   95.28%   95.33%   +0.04%     
==========================================
  Files          17       17              
  Lines         594      600       +6     
==========================================
+ Hits          566      572       +6     
  Misses         19       19              
  Partials        9        9              

Impacted Files	Coverage Δ
value.go	95.02% <100.00%> (+0.17%)	:arrow_up:

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