Add kwds support to deftype

[gilch]

For __init_subclass__ as supported by type().

Resolves #194

[codecov[bot]]

Codecov Report

Merging #219 (70abc78) into master (3443d48) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #219   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            6         6           
  Lines          710       710           
  Branches       109       109           
=========================================
  Hits           710       710           

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