proper example completeness

[drew-512]

added proper py.Context.Close() for completeness and added as test for examples/embedding

[codecov]

Codecov Report

Merging #164 (9b3b8be) into master (01cbebd) will increase coverage by 0.03%.
The diff coverage is 20.00%.

@@            Coverage Diff             @@
##           master     #164      +/-   ##
==========================================
+ Coverage   72.86%   72.89%   +0.03%     
==========================================
  Files          71       71              
  Lines       11678    11682       +4     
==========================================
+ Hits         8509     8516       +7     
+ Misses       2600     2595       -5     
- Partials      569      571       +2     

Impacted Files	Coverage Δ
examples/embedding/main.go	0.00% <0.00%> (ø)
examples/embedding/mylib.module.go	29.68% <0.00%> (-2.58%)	⬇️
main.go	15.62% <100.00%> (+2.72%)	⬆️
py/module.go	71.69% <0.00%> (ø)
modules/runtime.go	54.88% <0.00%> (+5.26%)	⬆️

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