update map-stream dependency

[rikkertkoppes]

es still uses map-stream 0.0.2, while you've already created 0.0.3 which solves out of order mapping.

Been cracking my head around this for a while :)

[dominictarr]

okay, fixed.

However, I'd suggest just using the map-stream directly, and avoiding utility collection style modules.
@substack has since convinced us all that these are a bad idea.

[dominictarr]

use event-stream@3.0.17