Fix issue 34 for coroutines

[stuebingerb]

This fixes issue #34 for the coroutines implementation.

[codecov]

Codecov Report

Merging #280 (0ee6991) into master (7826075) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #280      +/-   ##
============================================
+ Coverage     57.65%   57.68%   +0.03%     
- Complexity      726      727       +1     
============================================
  Files           131      131              
  Lines          5417     5417              
  Branches        454      454              
============================================
+ Hits           3123     3125       +2     
+ Misses         2096     2094       -2     
  Partials        198      198              

Impacted Files	Coverage Δ
...org/litote/kmongo/coroutine/CoroutineCollection.kt	49.39% <100.00%> (+0.48%)	⬆️

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[zigzago]

Thank you