fix typo in CHANGELOG.md (#333)

Author: eitoball

CHANGELOG.md

@@ -7,8 +7,9 @@
 #### Fixes
 
 * Your contribution here.
+* [#333](https://github.com/ruby-grape/grape-entity/pull/333): Fix typo in CHANGELOG.md - [@eitoball](https://github.com/eitoball).
 
-### 0.9.0 (2020-02-18)
+### 0.8.0 (2020-02-18)
 
 #### Features