Merge pull request #222 from usernamehw/patch-3

Spacing

1-js/04-object-basics/01-object/3-is-empty/solution.md

@@ -2,7 +2,7 @@ Just loop over the object and `return false` immediately if there's at least one
 
 ```js
 function isEmpty(obj) {
-  for(let key in obj) {
+  for (let key in obj) {
     return false;
   }
   return true;