Remove trailing whitespaces from CHANGELOG.

CHANGELOG.md

@@ -11,7 +11,7 @@ A new segment that allows users to define a custom command was added.
 
 ### `virtualenv` changes
 
-This segment now respects `VIRTUAL_ENV_DISABLE_PROMPT`. If this variable is set 
+This segment now respects `VIRTUAL_ENV_DISABLE_PROMPT`. If this variable is set
 to `true`, the segments does not get rendered.
 
 ### `load` changes
@@ -22,7 +22,7 @@ segment is able to show the free ram and used swap.
 ### `vcs` changes
 
 This prompt uses the `VCS_INFO` subsystem by ZSH. From now on this subsystem
-is only invoked if a `vcs` segment was configured. 
+is only invoked if a `vcs` segment was configured.
 
 ### `rvm` changes