add flush() to fix #113

[rrzaripov]

This closes issue #113 for me. But the code review is needed, possibly this solution is too slow.

[codecov-io]

Current coverage is 96.33%

Merging #122 into master will not affect coverage as of fc1378a

@@            master    #122   diff @@
======================================
  Files           11      11       
  Stmts          982     983     +1
  Branches         0       0       
  Methods          0       0       
======================================
+ Hit            946     947     +1
  Partial          0       0       
  Missed          36      36       

Review entire Coverage Diff as of fc1378a

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[dnozay]

@rrzaripov any update? If I could get your help, maybe I can close this issue sooner.