Add pyproject.toml

[codecov-commenter]

Codecov Report

Base: 81.99% // Head: 81.99% // No change to project coverage :thumbsup:

Coverage data is based on head (713b0d8) compared to base (b6ce8cc). Patch coverage: 80.00% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #37 +/- ## ======================================= Coverage 81.99% 81.99% ======================================= Files 5 5 Lines 211 211 ======================================= Hits 173 173 Misses 38 38 ``` | [Impacted Files](https://codecov.io/gh/pmneila/PyMCubes/pull/37?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | Coverage Δ | | |---|---|---| | [mcubes/version.py](https://codecov.io/gh/pmneila/PyMCubes/pull/37?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-bWN1YmVzL3ZlcnNpb24ucHk=) | `0.00% <0.00%> (ø)` | | | [mcubes/\_\_init\_\_.py](https://codecov.io/gh/pmneila/PyMCubes/pull/37?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-bWN1YmVzL19faW5pdF9fLnB5) | `100.00% <100.00%> (ø)` | | | [mcubes/exporter.py](https://codecov.io/gh/pmneila/PyMCubes/pull/37?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-bWN1YmVzL2V4cG9ydGVyLnB5) | `100.00% <100.00%> (ø)` | | | [mcubes/smoothing.py](https://codecov.io/gh/pmneila/PyMCubes/pull/37?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-bWN1YmVzL3Ntb290aGluZy5weQ==) | `99.28% <100.00%> (ø)` | | 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=None). 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=None)

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