streams v3 compat & add readable-stream#3

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jaawerth wants to merge 2 commits intotransduce:masterfrom

jaawerth:add-readable-stream

Commits on Mar 16, 2018

Add null to the end of the source array in readArray to close the stream. Fixes #2
jaawerth
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swap out stream core lib for readable-stream mirror for stable streams api across node versions
jaawerth
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