trim before splitting

Former-commit-id: 41fe28ec1eefb792ed85d1843ee2f221f735acf6

cli/single-file

@@ -101,7 +101,7 @@ async function runNextTask(tasks, options) {
 function rewriteURL(url, rewriteRules) {
 	url = url.trim();
 	rewriteRules.forEach(rewriteRule => {
-		const parts = rewriteRule.split(/ +/);
+		const parts = rewriteRule.trim().split(/ +/);
 		if (parts.length == 2) {
 			url = url.replace(new RegExp(parts[0]), parts[1]).trim();
 		}