Close gzip reader as per documentation

[bhavikkumar]

Close the gzip reader as per the documentation

[codecov-io]

Codecov Report

Merging #187 into master will increase coverage by 0.03%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #187      +/-   ##
=========================================
+ Coverage   77.16%   77.2%   +0.03%     
=========================================
  Files          18      18              
  Lines         635     636       +1     
=========================================
+ Hits          490     491       +1     
  Misses        104     104              
  Partials       41      41

Impacted Files	Coverage Δ
events/cloudwatch_logs.go	66.66% <100%> (+3.03%)	⬆️

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[bmoffatt]

Thanks!