Issue #27: Implemented Codecov

[alexmerlin]

@arhimede please provide the following for Codecov:

• [ ] badge snippet
• [ ] secret token on the repo

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (5.0@4b50c05). Click here to learn what that means. Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## 5.0 #28 +/- ## ====================================== Coverage ? 97.26% Complexity ? 19 ====================================== Files ? 6 Lines ? 73 Branches ? 0 ====================================== Hits ? 71 Misses ? 2 Partials ? 0 ```

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