Implement route tag

[jettify]

Fixes #115

[codecov]

Codecov Report

Merging #138 into master will increase coverage by 0.62%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #138      +/-   ##
==========================================
+ Coverage   97.13%   97.76%   +0.62%     
==========================================
  Files          13       13              
  Lines         523      536      +13     
  Branches       36       38       +2     
==========================================
+ Hits          508      524      +16     
+ Misses          7        6       -1     
+ Partials        8        6       -2

Impacted Files	Coverage Δ
aiozipkin/constants.py	100% <100%> (ø)	⬆️
aiozipkin/aiohttp_helpers.py	96.72% <100%> (+0.11%)	⬆️
aiozipkin/__init__.py	100% <100%> (ø)	⬆️
aiozipkin/record.py	100% <0%> (+6%)	⬆️

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