Fix lint warning.

src/index.ts

@@ -60,7 +60,9 @@ const connection = new knx.Connection({
       console.log('Connected!');
     },
     event: function (evt: string, src: string, dest: string, value: Buffer) {
-      main(evt, src, dest, value).then(() => { }).catch(e => console.log('Error: ', e))
+      main(evt, src, dest, value)
+      .then(() => {  /* This is intentional */ })
+      .catch(e => console.log('Error: ', e))
     }
   }
 });