Typo.

README.md

 ## Notifications
 *Libraries for working with notification software.*
 
-* [Nod](https://github.com/filp/nod) - A notification library (e.g. Growl).
+* [Nod](https://github.com/filp/nod) - A notification library (e.g., Growl).
 * [Notificato](https://github.com/wrep/notificato) - A library for handling push notifications.
 * [Notification Pusher](https://github.com/Ph3nol/NotificationPusher) - A standalone library for device push notifications.
 * [Notificator](https://github.com/namshi/notificator) - A lightweight notification library.