Customize Wordpress Admin Footer

custom-wp-admin-footer.php

<?php
//Customize the admin footer
add_filter('admin_footer_text', 'modify_footer_admin');
function modify_footer_admin () {
 	echo 'Created by <a href="http://yourwebsite.com" target="_blank">an awesome developer</a>.';
}

// Add custom footer version
function change_footer_version() {
  return 'Version 1.0';
}
add_filter( 'update_footer', 'change_footer_version', 9999 );
?>