Partly replace _ => with () => globally to conform with Googles JavaScript style guide if no parameters are expected in arrow functions

index.js

@@ -663,7 +663,7 @@ class Peer {
             return true;
         }
         this.requestRate += 1;
-        setTimeout(_ => this.requestRate -= 1, 10000);
+        setTimeout(() => this.requestRate -= 1, 10000);
         return false;
     }