Fix regression for environments without AbortController (#125)

index.js

@@ -118,8 +118,11 @@ const timeout = (promise, ms, abortController) => new Promise((resolve, reject)
 	/* eslint-disable promise/prefer-await-to-then */
 	promise.then(resolve).catch(reject);
 	delay(ms).then(() => {
+		if (supportsAbortController) {
+			abortController.abort();
+		}
+
 		reject(new TimeoutError());
-		abortController.abort();
 	});
 	/* eslint-enable promise/prefer-await-to-then */
 });