CompatHelper: bump compat for IrrationalConstants to 0.2, (keep existing compat)

[github-actions[bot]]

This pull request changes the compat entry for the IrrationalConstants package from 0.1 to 0.1, 0.2. 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[bot]]

Codecov Report

Base: 97.63% // Head: 97.63% // No change to project coverage :thumbsup:

Coverage data is based on head (afa9475) compared to base (037a3a7). Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #354 +/- ## ======================================= Coverage 97.63% 97.63% ======================================= Files 10 10 Lines 380 380 ======================================= Hits 371 371 Misses 9 9 ``` 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=JuliaGaussianProcesses). 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=JuliaGaussianProcesses)

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[willtebbutt]

Will merge when docs CI passes. Thanks for reviewing @devmotion