Merge CHANGELOG.md into NEWS.md

We accidentally introduced a CHANGELOG in [9050573] when NEWS already
existed.

This commit merges CHANGELOG back into NEWS, and adapts the NEWS format.

[9050573]: 9050573#diff-4ac32a78649ca5bdd8e0ba38b7006a1e

NEWS.md

@@ -1,17 +1,68 @@
-# 0.2.0
+master
+======
+
+Breaking Changes
+----------------
+
+* No longer default to `strict: true`.
+
+0.4.0
+=====
+
+Breaking Changes
+----------------
+
+* Rename the gem to `json_matchers`.
+
+0.3.1
+=====
+
+* No longer condone auto-loading RSpec. Add documentation around adding `require
+  "json_matchers/rspec"` to consumers' `spec/spec_helper.rb`
+
+Breaking Changes
+----------------
+
+* Rename module to `JsonMatchers`. This resolves clashing with
+  gems like `oj` / `oj_mimic_json` that take control of the standard library's
+  `json` module. As a result, the file to require is now `json_matchers`,
+  instead of `json/matchers`.
+
+0.3.0
+=====
+
+* Pass options from matcher to `JSON::Validator`
+
+0.2.2
+=====
+
+* Includes validation failure message in RSpec output
+
+0.2.1
+=====
+
+* Supports RSpec 2 syntax `failure_message_for_should` and
+  `failure_message_for_should_not`
+
+0.2.0
+=====
 
 * RSpec failure messages include both the body of the response, and the body of
   the JSON Schema file
 
-# 0.1.0
+0.1.0
+=====
 
-## Breaking Changes
+Breaking Changes
+----------------
 
 * Remove `schema_for` in favor of using `$ref`. To learn more about `$ref`,
   check out [Understanding JSON Schema Structuring](http://spacetelescope.github.io/understanding-json-schema/structuring.html)
 
-# 0.0.1
+0.0.1
+=====
 
-## Features
+Features
+--------
 
 * Validate your Rails response JSON with `match_response_schema`