v4.0.0

<a name"4.0.0">

4.0.0 (2016-11-27)

Features

• implement parsing for heregexes with interpolations (#87) (f0abec5a)

Breaking Changes

• Heregex expressions now always use the new Heregex node type
  rather than RegExp. In all cases, a Heregex node has an array of quasis and
  expressions.
  (f0abec5a)