fix build

fishercoder1534 · fishercoder1534 · commit 01ddad4a181a · 2020-02-11T21:46:16.000-08:00
diff --git a/src/main/java/com/fishercoder/solutions/_988.java b/src/main/java/com/fishercoder/solutions/_988.java
@@ -36,7 +36,7 @@
 public class _988 {
     public static class Solution1 {
         public String smallestFromLeaf(TreeNode root) {
-            List<String> paths = new ArrayList<>();
+            final List<String> paths = new ArrayList<>();
             Map<Integer, Character> map = new HashMap<>();
             map.put(0, 'a');
             map.put(1, 'b');
