Drop support for Python3.6.

[dajiaji]

No description provided.

[codecov]

Codecov Report

Merging #154 (8064eef) into main (cf54085) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #154   +/-   ##
=======================================
  Coverage   98.75%   98.75%           
=======================================
  Files          14       14           
  Lines        1365     1365           
=======================================
  Hits         1348     1348           
  Misses         17       17           

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