Replace list() with array_shift() for fetching optional positional argument

Author: schlessera

src/Core_Command.php

@@ -156,8 +156,8 @@ public function download( $args, $assoc_args ) {
 		$locale       = Utils\get_flag_value( $assoc_args, 'locale', 'en_US' );
 		$skip_content = Utils\get_flag_value( $assoc_args, 'skip-content' );
 
-		list( $download_url ) = $args;
-		$from_url             = ! empty( $download_url );
+		$download_url = array_shift( $args );
+		$from_url     = ! empty( $download_url );
 
 		if ( $from_url ) {
 			$version = null;