codecov and documentation

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 89.25%. Comparing base (ed2379c) to head (456ab6f). Report is 19 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #203 +/- ## ========================================== - Coverage 93.34% 89.25% -4.09% ========================================== Files 17 21 +4 Lines 871 977 +106 ========================================== + Hits 813 872 +59 - Misses 58 105 +47 ```

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