Change resume slug

functions.php

add_action( 'init', 'jm_update_resume_slug' );
function jm_update_resume_slug( ) {
	$resume_args = get_post_type_object('resume');
	if ( ! empty( $resume_args ) ) {
		$resume_args->rewrite = array(
			'slug'       => 'cv',
			'with_front' => false,
			'feeds'      => false,
			'pages'      => false,
		);
		register_post_type( $resume_args->name, $resume_args );
	}
}