Update Changelog.md

Author: v-momoin

Documentation/Guides/Changelog.md

@@ -5,7 +5,6 @@ This version contains improvements around concurrency.
 - [BUGFIX/IMPROVEMENT] On MacOS Mojave the feedback form can't be rendered properly with dark theme.
 Buttons and some other controls are invisible with dark theme which is fixed wiht this release. [#148] https://github.com/bitstadium/HockeySDK-Mac/pull/148 
 
-
 ## 5.1.0
 
 This version contains improvements around concurrency.