re-enable coveralls, bump goveralls to 0.0.11

[oliver006]

No description provided.

[codecov]

Codecov Report

Merging #554 (5febb7d) into master (6936aa3) will increase coverage by 0.57%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #554      +/-   ##
==========================================
+ Coverage   88.18%   88.75%   +0.57%     
==========================================
  Files          16       16              
  Lines        1320     1503     +183     
==========================================
+ Hits         1164     1334     +170     
- Misses         93       97       +4     
- Partials       63       72       +9     

Impacted Files	Coverage Δ
exporter/redis.go	77.64% <0.00%> (-8.47%)	⬇️
exporter/exporter.go	93.44% <0.00%> (+1.48%)	⬆️
exporter/keys.go	84.15% <0.00%> (+5.38%)	⬆️

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