Merge pull request #1358 from SeongUk-Han/add_missing_section

add removed a section divider in CHANGELOG.md

Author: dblock

CHANGELOG.md

@@ -56,6 +56,7 @@
 * [#1197](https://github.com/ruby-grape/grape/pull/1290): Fix using JSON and Array[JSON] as groups when parameter is optional - [@lukeivers](https://github.com/lukeivers).
 
 0.14.0 (12/07/2015)
+=================
 
 #### Features