Hide external from coverage report (#123)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.14%. Comparing base (3e7db41) to head (86a9f4f).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #143 +/- ## =========================================== + Coverage 83.35% 94.14% +10.79% =========================================== Files 21 19 -2 Lines 1928 1555 -373 =========================================== - Hits 1607 1464 -143 + Misses 321 91 -230 ```

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