Do not remove item from queue when iterating

[sebastiansimson]

If there was invalid data read for the queue and the resulting object is null, do not add to batch request. Make sure that the right number of events is removed after batch request, including the invalid data.

[codecov-io]

Codecov Report

Merging #20 into master will increase coverage by 0.15%.
The diff coverage is 66.66%.

@@             Coverage Diff              @@
##             master      #20      +/-   ##
============================================
+ Coverage     79.81%   79.96%   +0.15%     
  Complexity      154      154              
============================================
  Files            25       25              
  Lines           530      529       -1     
  Branches         26       26              
============================================
  Hits            423      423              
+ Misses           82       81       -1     
  Partials         25       25

Impacted Files	Coverage Δ	Complexity Δ
.../main/java/io/castle/android/queue/EventQueue.java	54.32% <66.66%> (+0.66%)	16 <0> (ø)	⬇️

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