Update README.md

Author: mumoshu

README.md

@@ -67,7 +67,7 @@ The Helm Diff Plugin
 
 * Shows a diff explaining what a helm rollback would change:
     This fetches the currently deployed version of a release
-  and compares it to deployed versions of a release, that you 
+  and compares it to the previously deployed versions of the release, that you 
   want to rollback. This can be used visualize what changes a 
   helm rollback will perform.