Compare matplotlib version using packaging.version

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (64659cb) 57.15% compared to head (389735f) 57.15%.

Files	Patch %	Lines
ffn/core.py	0.00%	1 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #208 +/- ## ======================================= Coverage 57.15% 57.15% ======================================= Files 4 4 Lines 1160 1160 Branches 249 249 ======================================= Hits 663 663 Misses 433 433 Partials 64 64 ```

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