Add changelog for 0.5.1

[codecov[bot]]

Codecov Report

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

Project coverage is 78.05%. Comparing base (e5d0438) to head (0aa8c51).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #508 +/- ## ======================================= Coverage 78.05% 78.05% ======================================= Files 17 17 Lines 4196 4196 ======================================= Hits 3275 3275 Misses 921 921 ```

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