extend-profile-contactmethods.php

<?php
add_filter( 'user_contactmethods', 'limecuda_user_contactmethods', 10, 2 );
/**
 * Filter the Contact Methods to include Github
 *
 * @since     1.1.0
 * @param     array $methods The registered Contact methods.
 * @param     array $user    The current user object.
 */
function limecuda_user_contactmethods( $methods, $user ) {

	$methods['github'] = 'Github';

	return $methods;

}