Allow kwargs when evaluating evolution rates

[codecov[bot]]

Codecov Report

Base: 87.86% // Head: 87.83% // Decreases project coverage by -0.02% :warning:

Coverage data is based on head (9c90be6) compared to base (6c7d8b6). Patch coverage: 80.00% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #296 +/- ## ========================================== - Coverage 87.86% 87.83% -0.03% ========================================== Files 70 69 -1 Lines 10348 10328 -20 ========================================== - Hits 9092 9072 -20 Misses 1256 1256 ``` | Flag | Coverage Δ | | |---|---|---| | unittests | `87.83% <80.00%> (-0.03%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zwicker-group#carryforward-flags-in-the-pull-request-comment) to find out more. | [Impacted Files](https://codecov.io/gh/zwicker-group/py-pde/pull/296?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zwicker-group) | Coverage Δ | | |---|---|---| | [pde/pdes/pde.py](https://codecov.io/gh/zwicker-group/py-pde/pull/296/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zwicker-group#diff-cGRlL3BkZXMvcGRlLnB5) | `92.59% <ø> (ø)` | | | [pde/pdes/base.py](https://codecov.io/gh/zwicker-group/py-pde/pull/296/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zwicker-group#diff-cGRlL3BkZXMvYmFzZS5weQ==) | `80.95% <78.57%> (ø)` | | | [pde/tools/parameters.py](https://codecov.io/gh/zwicker-group/py-pde/pull/296/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zwicker-group#diff-cGRlL3Rvb2xzL3BhcmFtZXRlcnMucHk=) | `96.25% <100.00%> (ø)` | | | [pde/\_\_init\_\_.py](https://codecov.io/gh/zwicker-group/py-pde/pull/296/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zwicker-group#diff-cGRlL19faW5pdF9fLnB5) | | | 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=zwicker-group). 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=zwicker-group)

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