Add pushover, a wrapper for the Pushover API

Pushover is a service to send and receive push notifications.

README.md

@@ -720,6 +720,7 @@ See [go-hardware](https://github.com/rakyll/go-hardware) for a comprehensive lis
 * [hipchat](https://github.com/andybons/hipchat) - This project implements a golang client library for the Hipchat API.
 * [hipchat (xmpp)](https://github.com/daneharrigan/hipchat) - A golang package to communicate with HipChat over XMPP.
 * [mixpanel](https://github.com/dukex/mixpanel) - Mixpanel is a library for tracking events and sending Mixpanel profile updates to Mixpanel from your go applications.
+* [pushover](https://github.com/gregdel/pushover) - Go wrapper for the Pushover API.
 * [rrdaclient](https://github.com/Omie/rrdaclient) - Go Library to access statdns.com API, which is in turn RRDA API. DNS Queries over HTTP.
 * [shopify](https://github.com/rapito/go-shopify) - Go Library to make CRUD request to the Shopify API.
 * [smite](https://github.com/sergiotapia/smitego) - Go package to wraps access to the Smite game API.