message: Update changelog for 18.0.0
diff: @@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file.
  The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
  and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
  -## [Unreleased]
  +## [18.0.0] - 2018-10-24
  ### Added
  - Models:
  - `registration-schema` (including related adapter & serializer)
  @@ -30,6 +30,13 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
  - `register` - sign up page
  - Transforms:
  - `fixstringarray` - similar to `fixstring` transform (unencodes special characters), but for string arrays
  +- Utils:
  + - `param` - drop-in replacement for jQuery.param
  +- Helpers:
  + - `math` - A helper to render TeX statements using KaTeX
  +- Engines:
  + - `ember-osf-registries` - moved/upgraded into the registries engine
  + - `collections` - Add collections engine
  - Tests:
  - `guid-node/registrations` acceptance test
  - `tags-widget` component integration test
  @@ -39,15 +46,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
  - `osf-model` - creates model, adapter, and serializer for an OSF model
  - Types:
  - `ember-cli-mirage` - the 70% that seems possible to express in typescript
  -- Engines:
  - - `ember-osf-registries` - moved/upgraded into the registries engine
  - - `collections` - Add collections engine
  - Handbook:
  - `tags-widget` - added to the handbook
  -- Utils:
  - - `param` - drop-in replacement for jQuery.param
  -- Helpers:
  - - `math` - A helper to render TeX statements using KaTeX
  ### Changed
  - Models:
  