do the rename here, too

Author: pryrt

README.md

@@ -24,7 +24,7 @@ Summary
 * [Plugins](content/docs/plugins.md)
 * [Preferences](content/docs/preferences.md)
 * [Themes](content/docs/themes.md)
-* [Plugin Development: Messages and Notifications](content/docs/messages-notifications.md)
+* [Plugin Communication](content/docs/plugin-communication.md)
 * [Command Line Arguments](content/docs/command-prompt.md)
 * [Shell Extension](content/docs/shell-extension.md)
 * [Binary Translation](content/docs/binary-translation.md)