add js solution for leetcode 203

Author: swiftwind0405

README.md

@@ -226,7 +226,7 @@ LeetCode
 |206|[Reverse Linked List](https://leetcode.com/problems/reverse-linked-list/)| |Easy|
 |205|[Isomorphic Strings](https://leetcode.com/problems/isomorphic-strings/)| |Easy|
 |204|[Count Primes](https://leetcode.com/problems/count-primes/)| |Easy|
-|203|[Remove Linked List Elements](https://leetcode.com/problems/remove-linked-list-elements/)| |Easy|
+|203|[Remove Linked List Elements](https://leetcode.com/problems/remove-linked-list-elements/)| [js](./algorithms/removeLinkedListElements/removeLinkedListElements.js) |Easy|
 |202|[Happy Number](https://leetcode.com/problems/happy-number/)| |Easy|
 |201|[Bitwise AND of Numbers Range](https://leetcode.com/problems/bitwise-and-of-numbers-range/)| |Medium|
 |200|[Number of Islands](https://leetcode.com/problems/number-of-islands/)| |Medium|

algorithms/removeLinkedListElements/removeLinkedListElements.js

@@ -0,0 +1,8 @@
+var removeElements = function(head, val) {
+    if (head === null) {
+        return null;
+    }
+
+    head.next = removeElements(head.next, val);
+    return head.val === val ? head.next : head;
+};