Update README.markdown

Author: richard-ash

README.markdown

@@ -195,7 +195,7 @@ Most of the time using just the built-in `Array`, `Dictionary`, and `Set` types
 - [Minimum Spanning Tree](Minimum%20Spanning%20Tree/)
 - [All-Pairs Shortest Paths](All-Pairs%20Shortest%20Paths/)
 - [Dijkstra's shortest path algorithm](Dijkstra%20Algorithm/)
-- [A*](A-star/)
+- [A-star](A-star/)
 
 ## Puzzles