Update `conf.py`

[codecov[bot]]

Codecov Report

Base: 83.68% // Head: 81.94% // Decreases project coverage by -1.73% :warning:

Coverage data is based on head (85ebccb) compared to base (1979c33). Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #88 +/- ## ========================================== - Coverage 83.68% 81.94% -1.74% ========================================== Files 22 22 Lines 864 864 ========================================== - Hits 723 708 -15 - Misses 141 156 +15 ``` | [Impacted Files](https://codecov.io/gh/MRChemSoft/vampyr/pull/88?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=MRChemSoft) | Coverage Δ | | |---|---|---| | [src/vampyr/treebuilders/grids.h](https://codecov.io/gh/MRChemSoft/vampyr/pull/88/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=MRChemSoft#diff-c3JjL3ZhbXB5ci90cmVlYnVpbGRlcnMvZ3JpZHMuaA==) | `87.50% <0.00%> (-12.50%)` | :arrow_down: | | [src/vampyr/operators/derivatives.h](https://codecov.io/gh/MRChemSoft/vampyr/pull/88/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=MRChemSoft#diff-c3JjL3ZhbXB5ci9vcGVyYXRvcnMvZGVyaXZhdGl2ZXMuaA==) | `85.71% <0.00%> (-7.15%)` | :arrow_down: | | [src/vampyr/treebuilders/arithmetics.h](https://codecov.io/gh/MRChemSoft/vampyr/pull/88/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=MRChemSoft#diff-c3JjL3ZhbXB5ci90cmVlYnVpbGRlcnMvYXJpdGhtZXRpY3MuaA==) | `88.04% <0.00%> (-6.53%)` | :arrow_down: | | [src/vampyr/treebuilders/applys.h](https://codecov.io/gh/MRChemSoft/vampyr/pull/88/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=MRChemSoft#diff-c3JjL3ZhbXB5ci90cmVlYnVpbGRlcnMvYXBwbHlzLmg=) | `91.30% <0.00%> (-4.35%)` | :arrow_down: | | [src/vampyr/treebuilders/project.h](https://codecov.io/gh/MRChemSoft/vampyr/pull/88/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=MRChemSoft#diff-c3JjL3ZhbXB5ci90cmVlYnVpbGRlcnMvcHJvamVjdC5o) | `75.75% <0.00%> (-3.04%)` | :arrow_down: | | [src/vampyr/functions/gaussians.h](https://codecov.io/gh/MRChemSoft/vampyr/pull/88/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=MRChemSoft#diff-c3JjL3ZhbXB5ci9mdW5jdGlvbnMvZ2F1c3NpYW5zLmg=) | `80.43% <0.00%> (-2.18%)` | :arrow_down: | | [src/vampyr/operators/convolutions.h](https://codecov.io/gh/MRChemSoft/vampyr/pull/88/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=MRChemSoft#diff-c3JjL3ZhbXB5ci9vcGVyYXRvcnMvY29udm9sdXRpb25zLmg=) | `92.45% <0.00%> (-1.89%)` | :arrow_down: | 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=MRChemSoft). 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=MRChemSoft)

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