Remove superfluous sort function

#8 (comment)

Co-authored-by: Garret Alfert <alfert@wevelop.de>

src/chat-messages.js

@@ -18,7 +18,7 @@ function lowestNumberInListing(items) {
   const sortedNumbers = Object.keys(items)
                               .map(i => parseInt(i))
                               .filter(i => !Number.isNaN(i))
-                              .sort(function(a, b) { return a - b });
+                              .sort();
   return sortedNumbers[0];
 }