fix block warn

[UshakovVasilii]

[codecov-commenter]

Codecov Report

Merging #10 (3e1562e) into master (e01770c) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #10   +/-   ##
=======================================
  Coverage   86.30%   86.30%           
=======================================
  Files           8        8           
  Lines         292      292           
=======================================
  Hits          252      252           
  Misses         40       40           

Impacted Files	Coverage Δ
slack_blockkit/utils/utils.py	65.71% <100.00%> (ø)

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