v4.0.0

<a name"4.0.0">

4.0.0 (2017-04-26)

Features

• upgrade to RxJS 5 (#5) (4119ef4e)

Breaking Changes

• this upgrades all deps

(af8a3af7)

• this commit upgrades flight-with-observe to to RxJS version 5:
  https://github.com/ReactiveX/rxjs/blob/master/MIGRATION.md
  (4119ef4e)