Switch to upstream version of prometheus-client

[errm]

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[codecov-io]

Codecov Report

Merging #5 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master       #5      +/-   ##
==========================================
+ Coverage    99.9%   99.91%   +<.01%     
==========================================
  Files          14       14              
  Lines        1071     1144      +73     
==========================================
+ Hits         1070     1143      +73     
  Misses          1        1

Impacted Files	Coverage Δ
lib/promenade/kafka/connection_subscriber.rb	100% <100%> (ø)	⬆️
spec/kafka_spec.rb	100% <100%> (ø)	⬆️
lib/promenade/kafka/consumer_subscriber.rb	100% <100%> (ø)	⬆️
lib/promenade/setup.rb	100% <100%> (ø)	⬆️
spec/setup_spec.rb	100% <100%> (ø)	⬆️
lib/promenade/kafka/async_producer_subscriber.rb	100% <100%> (ø)	⬆️
spec/promenade_spec.rb	100% <100%> (ø)	⬆️
lib/promenade/kafka/fetcher_subscriber.rb	100% <100%> (ø)	⬆️
spec/prometheus_spec.rb	100% <100%> (ø)	⬆️
lib/promenade/kafka/subscriber.rb	100% <100%> (ø)	⬆️
... and 3 more

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