SVG support

[nikolaydubina]

No description provided.

[codecov]

Codecov Report

Merging #13 (e68737a) into master (ec04dc4) will increase coverage by 0.52%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #13      +/-   ##
==========================================
+ Coverage   95.62%   96.15%   +0.52%     
==========================================
  Files           6        7       +1     
  Lines         183      208      +25     
==========================================
+ Hits          175      200      +25     
  Misses          4        4              
  Partials        4        4              

Impacted Files	Coverage Δ
charts/dayiter.go	100.00% <100.00%> (ø)
charts/svg.go	100.00% <100.00%> (ø)

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