Add support for Graphite tag format

[codecov[bot]]

Codecov Report

Merging #29 into master will increase coverage by 0.40%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #29      +/-   ##
==========================================
+ Coverage   88.37%   88.77%   +0.40%     
==========================================
  Files           5        5              
  Lines         344      294      -50     
==========================================
- Hits          304      261      -43     
+ Misses         37       31       -6     
+ Partials        3        2       -1     

Impacted Files	Coverage Δ
tags.go	100.00% <ø> (ø)
buffers.go	80.00% <0.00%> (-2.36%)	:arrow_down:
loops.go	78.08% <0.00%> (-0.67%)	:arrow_down:
client.go	98.77% <0.00%> (-0.15%)	:arrow_down:
options.go	50.00% <0.00%> (ø)

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[bconway]

It would be great to have this merged, is it possible?

[MrDOS]

Thank you for merging!