CompatHelper: bump compat for PhyloNetworks to 0.16, (keep existing compat)

[github-actions[bot]]

This pull request changes the compat entry for the PhyloNetworks package from 0.15.2 to 0.15.2, 0.16. This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry. It is your responsibility to make sure that your package tests pass before you merge this pull request.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (b2f7137) 98.12% compared to head (6c005d8) 98.12%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #24 +/- ## ======================================= Coverage 98.12% 98.12% ======================================= Files 4 4 Lines 532 532 ======================================= Hits 522 522 Misses 10 10 ``` Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=C%C3%A9cile+An%C3%A9). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=C%C3%A9cile+An%C3%A9)

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