define 2-arg Base.hash

[stevengj]

If you only define the 1-argument hash(o::Py), then the 2-argument form hash(o, h::UInt) falls back to the generic Base method using objectid(o), which is not what you want.

(Subtracting - 3h is what Base.hash typically does to mix hashes; I'm not sure if you want to do something fancier here?)

[codecov]

Codecov Report

Merging #154 (2b7705f) into main (b4528b7) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##             main     #154   +/-   ##
=======================================
  Coverage   29.01%   29.01%           
=======================================
  Files          70       70           
  Lines        4012     4012           
=======================================
  Hits         1164     1164           
  Misses       2848     2848           

Impacted Files	Coverage Δ
src/Py.jl	27.30% <0.00%> (ø)

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[cjdoris]

Looks great, thanks.