Merge pull request #103 from kingdavidmartins/update-head-of-list

update description of head & ran npm run build-list

snippets/head-of-list.md

@@ -1,6 +1,6 @@
 ### Head of list
 
-Return `arr[0]`.
+Use `arr[0]` to return the first element of the passed array.
 
 ```js
 const head = arr => arr[0];