Add changelog for v2.1.0

[sergiught]

📝 Checklist

• [x] All new/changed/fixed functionality is covered by tests (or N/A)
• [x] I have added documentation for all new/changed functionality (or N/A)

🔧 Changes

📚 References

🔬 Testing

[codecov-commenter]

Codecov Report

Base: 80.52% // Head: 80.52% // No change to project coverage :thumbsup:

Coverage data is based on head (b5e7a51) compared to base (a9dd2d3). Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #177 +/- ## ======================================= Coverage 80.52% 80.52% ======================================= Files 9 9 Lines 421 421 ======================================= Hits 339 339 Misses 69 69 Partials 13 13 ``` 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=auth0). 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=auth0)

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