fix use of 'catch' instead of 'try'

integration.js

@@ -36,7 +36,7 @@ const infoHash = '(m.%5bO%83i%85S(3j%c1%26%3a%e0*z%60%d5';
       'expected every response entry to resemble ip:port',
     );
   });
-})().catch(
+})().then(
   () => {
     console.log('ok!');
     process.exit(0);