Fix tests and docs builld

[codecov-commenter]

Codecov Report

Patch coverage: 7.14% and project coverage change: -0.07 :warning:

Comparison is base (d4bc752) 82.41% compared to head (8993adc) 82.34%.

:exclamation: Current head 8993adc differs from pull request most recent head 4203a70. Consider uploading reports for the commit 4203a70 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #16 +/- ## ========================================== - Coverage 82.41% 82.34% -0.07% ========================================== Files 48 48 Lines 4919 4923 +4 ========================================== Hits 4054 4054 - Misses 865 869 +4 ``` | [Impacted Files](https://app.codecov.io/gh/ufo-kit/syris/pull/16?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ufo-kit) | Coverage Δ | | |---|---|---| | [syris/materials.py](https://app.codecov.io/gh/ufo-kit/syris/pull/16?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ufo-kit#diff-c3lyaXMvbWF0ZXJpYWxzLnB5) | `74.77% <0.00%> (-1.40%)` | :arrow_down: | | [syris/physics.py](https://app.codecov.io/gh/ufo-kit/syris/pull/16?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ufo-kit#diff-c3lyaXMvcGh5c2ljcy5weQ==) | `66.89% <0.00%> (ø)` | | | [syris/\_\_init\_\_.py](https://app.codecov.io/gh/ufo-kit/syris/pull/16?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ufo-kit#diff-c3lyaXMvX19pbml0X18ucHk=) | `90.62% <100.00%> (ø)` | |

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