Use >= for pyyaml dependency so it works with minimumdependencies.yml

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (0d1eece) 99.02% compared to head (807eb3a) 99.02%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #27 +/- ## ======================================= Coverage 99.02% 99.02% ======================================= Files 2 2 Lines 205 205 ======================================= Hits 203 203 Misses 2 2 ```

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