[#84] Updated Changelog (#86)

- Fixed a mistake where recent changes had been put under version 0.19.0 rather than version 0.18.0

Author: ashercuedo

CHANGELOG.md

@@ -1,11 +1,8 @@
-# 0.19.0
-
-* The `app` property was added to `HookCheckSuite` (resolves #82)
-* The `permission` property has been added to the above mentioned `app` property (resolves #82)
-
 # 0.18.0
 
 * A `draft` field was added to `HookPullRequest` (resolves #75)
+* The `app` property was added to `HookCheckSuite` (resolves #82)
+* The `permission` property has been added to the above mentioned `app` property (resolves #82)
 
 # 0.17.0