Close Pubsub client when Acker or Puller closes

[codecov-io]

Codecov Report

Merging #39 into master will increase coverage by 0.05%. The diff coverage is 100%.

@@             Coverage Diff              @@
##             master      #39      +/-   ##
============================================
+ Coverage        76%   76.05%   +0.05%     
  Complexity      190      190              
============================================
  Files            26       26              
  Lines           900      902       +2     
  Branches         59       59              
============================================
+ Hits            684      686       +2     
  Misses          183      183              
  Partials         33       33

Impacted Files	Coverage Δ	Complexity Δ
...com/spotify/google/cloud/pubsub/client/Puller.java	81.73% <100%> (+0.16%)	20 <0> (ø)	:arrow_down:
.../com/spotify/google/cloud/pubsub/client/Acker.java	83.48% <100%> (+0.15%)	18 <0> (ø)	:arrow_down:

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[i-maravic]

+1