Fix github actions badge path

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (6a603c6) 84.72% compared to head (a932ac3) 84.72%. Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #149 +/- ## ======================================= Coverage 84.72% 84.72% ======================================= Files 10 10 Lines 1244 1244 ======================================= Hits 1054 1054 Misses 190 190 ```

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