next return fixed in filter

[senpathi]

Fix issue #21

[codecov-commenter]

Codecov Report

Merging #22 (9f42c33) into master (da45145) will not change coverage.
The diff coverage is 50.00%.

❗ Current head 9f42c33 differs from pull request most recent head cf5631c. Consider uploading reports for the commit cf5631c to get more accurate results

@@           Coverage Diff           @@
##           master      #22   +/-   ##
=======================================
  Coverage   11.52%   11.52%           
=======================================
  Files          71       71           
  Lines        4557     4557           
=======================================
  Hits          525      525           
  Misses       3959     3959           
  Partials       73       73           

Impacted Files	Coverage Δ
kstream/worker_pool/pool.go	0.00% <0.00%> (ø)
kstream/processors/filter.go	15.38% <100.00%> (ø)

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