Added cache control header.

[c1moore]

Adds header to disable cache control. Closes #1092

[codecov]

Codecov Report

Merging #1094 (155cc51) into master (b144aa6) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1094      +/-   ##
==========================================
+ Coverage   78.16%   78.21%   +0.05%     
==========================================
  Files           6        6              
  Lines         403      404       +1     
==========================================
+ Hits          315      316       +1     
  Misses         58       58              
  Partials       30       30              

Impacted Files	Coverage Δ
pkg/server/server.go	86.29% <100.00%> (+0.11%)	⬆️

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[jhaals]

Sounds like a good addition 👍