fixed error handling

lib/fetch/bg/fetch.js

@@ -28,10 +28,10 @@
 
 	browser.runtime.onMessage.addListener(request => {
 		if (request.method) {
-			return new Promise((resolve, reject) => {
+			return new Promise(resolve => {
 				onRequest(request)
 					.then(resolve)
-					.catch(error => reject({ error: error.toString() }));
+					.catch(error => resolve({ error: error.toString() }));
 			});
 		}
 	});