Added a separate deprecated section to changelog

Author: iainbeeston

CHANGELOG.md

@@ -12,11 +12,13 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 - Made the `:clear_cache` option for `validate` also clear the URI parse cache
 - Moved `JSON::Validator.absolutize_ref` and the ref manipulating code in
   `JSON::Schema::RefAttribute` into `JSON::Util::URI`
-- Deprecated `JSON::Validator#validator_for` in favor of `JSON::Validator#validator_for_uri`
-- Deprecated `JSON::Validator.validate2` in favor of `JSON::Validator.validate!`
-- Deprecated `JSON::Schema::Validator#extend_schema_definition` in favour of subclassing
 - Made validation errors refer to json schema types not ruby types
 
+### Deprecated
+- `JSON::Validator#validator_for` in favor of `JSON::Validator#validator_for_uri`
+- `JSON::Validator.validate2` in favor of `JSON::Validator.validate!`
+- `JSON::Schema::Validator#extend_schema_definition` in favour of subclassing
+
 ## [2.7.0] - 2016-09-29
 
 ### Fixed