133 update readme for v20

[codecov[bot]]

Codecov Report

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

Project coverage is 57.47%. Comparing base (c0b409f) to head (21b32f0). Report is 2 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #134 +/- ## ======================================= Coverage 57.47% 57.47% ======================================= Files 38 38 Lines 1738 1738 Branches 158 158 ======================================= Hits 999 999 Misses 727 727 Partials 12 12 ```

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