fix build

fishercoder1534 · fishercoder1534 · commit dc01552e74ed · 2019-05-31T07:45:35.000-07:00
diff --git a/src/main/java/com/fishercoder/solutions/_987.java b/src/main/java/com/fishercoder/solutions/_987.java
@@ -2,7 +2,10 @@
 
 import com.fishercoder.common.classes.TreeNode;
 
-import java.util.*;
+import java.util.List;
+import java.util.ArrayList;
+import java.util.PriorityQueue;
+import java.util.TreeMap;
 
 /**
  * 987. Vertical Order Traversal of a Binary Tree
