Adds Supports with multiple type args

[sobolevn]

Closes #244
Closes #249

[codecov-commenter]

Codecov Report

Merging #250 (12ffe9a) into master (d63f18b) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #250   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines           89        89           
  Branches        12        12           
=========================================
  Hits            89        89           

Impacted Files	Coverage Δ
classes/_typeclass.py	100.00% <100.00%> (ø)

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