Use codecov token in ci.yml

[codecov[bot]]

Codecov Report

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

Comparison is base (286eba5) 87.30% compared to head (3d7f906) 88.12%. Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #182 +/- ## ========================================== + Coverage 87.30% 88.12% +0.81% ========================================== Files 11 11 Lines 1095 1204 +109 ========================================== + Hits 956 1061 +105 - Misses 139 143 +4 ```

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