Use the `crs` function exported by Meshes.jl

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 94.72%. Comparing base (089bbe5) to head (cce72b8).

Files	Patch %	Lines
src/conversion.jl	80.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #98 +/- ## ======================================= Coverage 94.72% 94.72% ======================================= Files 17 17 Lines 1080 1080 ======================================= Hits 1023 1023 Misses 57 57 ```

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