Add pushover alerts to rc.{local,shutdown}.

etc/rc.local

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # Default rc.local for void; add your custom commands here.
 #
 # This is run by runit in stage 2 before the services are executed

etc/rc.shutdown

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # Default rc.shutdown for void; add your custom commands here.
 #
 # This is run by runit in stage 3 after the services are stopped