edit & merge via vim

> Error in config file
> Set path to your preferred text merge editor in khard's config file or the $MERGE_EDITOR shell variable
> Example for khard.conf: merge_editor = vimdiff

khard.conf

@@ -1,3 +1,7 @@
 [addressbooks]
 [[default]]
 path = ~/Contacts/
+
+[general]
+editor = vim
+merge_editor = vimdiff