doc: indicate stream impl from node versions (#424)
doc: indicate stream impl from node versions (#424)

* doc: indicate stream impl from node versions

* doc: fix typo

Co-Authored-By: Vincent Weevers <1d6e1cf70ec6f9ab28d3ea4b27a49a77654d370e@vincentweevers.nl>

Co-authored-by: Vincent Weevers <1d6e1cf70ec6f9ab28d3ea4b27a49a77654d370e@vincentweevers.nl>

iojs/readable-stream