Use release version of MUnit, remove unnecessary comment about early-semver

[codecov[bot]]

Codecov Report

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

Project coverage is 87.67%. Comparing base (57ead77) to head (deafb7c). Report is 121 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #541 +/- ## ======================================= Coverage 87.67% 87.67% ======================================= Files 137 137 Lines 5468 5468 Branches 442 442 ======================================= Hits 4794 4794 Misses 674 674 ```

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