Prometheus invalidutf8

[aldas]

relates to #122 and #117

[codecov]

Codecov Report

Attention: Patch coverage is 42.85714% with 12 lines in your changes missing coverage. Please review.

Project coverage is 63.51%. Comparing base (e3d5d99) to head (67d74d4).
Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
echoprometheus/prometheus.go	42.85%	8 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #124      +/-   ##
==========================================
- Coverage   64.08%   63.51%   -0.58%     
==========================================
  Files           9        9              
  Lines         944      962      +18     
==========================================
+ Hits          605      611       +6     
- Misses        300      308       +8     
- Partials       39       43       +4     

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