fix shebangs

src/delete_labels.php

@@ -1,4 +1,4 @@
-#!/bin/php
+#!/usr/bin/php
 <?php
 /****************************************************
 * This will loop through a list of label names

src/delete_me.php

@@ -1,4 +1,4 @@
-#!/bin/php
+#!/usr/bin/php
 <?php
 /**************************************************
 * this will process all issues titled "delete me":

src/delete_nags.php

@@ -1,4 +1,4 @@
-#!/bin/php
+#!/usr/bin/php
 <?php
 /**************************************************************
 * This will delete all comments that match a specific keyword