fix: Slack badge

[amirhessam88]

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (4f15769) to head (fb667a6).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master        #7   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           25        25           
  Branches         1         1           
=========================================
  Hits            25        25           

Flag	Coverage Δ
unittests	100.00% <ø> (ø)

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