Fix console.warn

Author: GilbertCherrie

app/javascript/http_api/fetch.js

@@ -59,7 +59,7 @@ function processData(o) {
   }
 
   // fetch supports more types but we aren't using any of those yet..
-  console.warn('Unknown type for request data - please provide a plain object or a string', o);
+  console.warn('Unknown type for request data - please provide a plain object or a string');
   return null;
 }