v4.0.0

<a name"4.0.0">

4.0.0 (2016-07-11)

Bug Fixes

• middleware: change RequestId middleware's config to work with Heroku by default (05dcc189)

Breaking Changes

• RequestId’s default configuration had been changed.
  The default header and query params are ‘x-request-id’.

  (05dcc189)