use /usr/bin/env for making it more compatible

When using /usr/bin/env bash you do not rely on having bash in /bin which is for example the case with freebsd where it is located at /usr/local/bin/bash

pushover.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Default config vars
 CURL="$(which curl)"