feat: ts compile target up to ES2020

[codecov[bot]]

Codecov Report

Merging #430 (d8a6c5e) into master (19b0f20) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #430   +/-   ##
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  Coverage   99.42%   99.42%           
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  Files           8        8           
  Lines        1212     1212           
  Branches      239      239           
=======================================
  Hits         1205     1205           
  Misses          7        7           

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[github-actions[bot]]

:tada: This PR is included in version 3.10.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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