Updated linter to work with restructure

snippets/flatten.md

@@ -5,7 +5,7 @@ Flattens an array.
 Use a new array and concatenate it with the spread input array causing a shallow denesting of any contained arrays.
 
 ```js
-const flatten = arr => [ ].concat( ...arr );
+const flatten = arr => [ ].concat(...arr);
 ```
 
 ```js