Docs/new oz docgen

[galekseev]

Updated solidity-docgen to the latest version 0.6.36-beta.
Benefits
Integrated with hardhat
Compatible with latest solidity-compiler

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.23%. Comparing base (6d633af) to head (5a4227e).
Report is 3 commits behind head on master.

❗ Current head 5a4227e differs from pull request most recent head 2b7061d. Consider uploading reports for the commit 2b7061d to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #138   +/-   ##
=======================================
  Coverage   93.23%   93.23%           
=======================================
  Files          17       17           
  Lines         340      340           
  Branches       66       66           
=======================================
  Hits          317      317           
  Misses         23       23           

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