__ne__ of set return NotImplemented

[HyeockJinKim]

if type of other is not set,
return NotImplemented

[codecov-io]

Codecov Report

Merging #110 into master will increase coverage by 0.19%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #110      +/-   ##
==========================================
+ Coverage   69.64%   69.84%   +0.19%     
==========================================
  Files          60       60              
  Lines       10810    10812       +2     
==========================================
+ Hits         7529     7552      +23     
+ Misses       2750     2726      -24     
- Partials      531      534       +3

Impacted Files	Coverage Δ
py/set.go	75% <100%> (+16.81%)	⬆️
py/bool.go	34.04% <0%> (+6.38%)	⬆️

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[ncw]

Thank you :-) I'll merge this now.