py: Support zip builtin feature

[corona10]

Implement built-in zip

[codecov-io]

Codecov Report

Merging #45 into master will increase coverage by 0.05%.
The diff coverage is 91.3%.

@@ Coverage Diff @@## master #45 +/- ## ========================================== + Coverage 65.95% 66.01% +0.05%  ========================================== Files 57 58 +1 Lines 10208 10231 +23 ========================================== + Hits 6733 6754 +21 - Misses 3002 3003 +1 - Partials 473 474 +1

Impacted Files	Coverage Δ
builtin/builtin.go	78.77% <100%> (+0.05%)	⬆️
py/zip.go	90.9% <90.9%> (ø)

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[corona10]

@ncw Please take a look! Thanks alot!

[ncw]

I think that is looking very good!

A minor thing inline :-)

[corona10]

@ncw
Done, Thank you for your review.
I hope your family's health improves now.
While I served a military service, one of my comrades was sick with norovirus and he told me that that time was one of the worst experience in his life.

[corona10]

And always thank you for always giving me a kind review even though you are busy.

[ncw]

That looks great now - thank you :-)