Update README.markdown

Author: scalls

README.markdown

@@ -136,7 +136,6 @@ Most of the time using just the built-in `Array`, `Dictionary`, and `Set` types
 
 - [Linked List](Linked List/). A sequence of data items connected through links. Covers both singly and doubly linked lists.
 - Skip List
-- [Adjacency List](Adjacency-List/) :construction:
 
 ### Trees
 
@@ -174,6 +173,7 @@ Most of the time using just the built-in `Array`, `Dictionary`, and `Set` types
 - [Shortest Path](Shortest Path %28Unweighted%29/) on an unweighted tree
 - [Minimum Spanning Tree](Minimum Spanning Tree %28Unweighted%29/) on an unweighted tree
 - All Paths
+- [Adjacency List](Adjacency-List/) :construction:
 
 ## Puzzles