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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