update link in Readme

Author: ivanmmarkovic

README.md

@@ -7,5 +7,5 @@ Code from Problem Solving with Algorithms and Data Structures using Python
 
 
 ### [Graphs](https://github.com/ivanmmarkovic/Problem-Solving-with-Algorithms-and-Data-Structures-using-Python/tree/master/graphs)
-- [dijkstra algorithm](https://github.com/ivanmmarkovic/Problem-Solving-with-Algorithms-and-Data-Structures-using-Python/tree/master/graphs/dijkstra)
-    - [Priority Queue](https://github.com/ivanmmarkovic/Problem-Solving-with-Algorithms-and-Data-Structures-using-Python/tree/master/graphs/dijkstra/priority-queue-impl-adjacency-map)
+- [Dijkstra algorithm](https://github.com/ivanmmarkovic/Problem-Solving-with-Algorithms-and-Data-Structures-using-Python/tree/master/graphs/dijkstra)
+    - [Priority Queue implementation](https://github.com/ivanmmarkovic/Problem-Solving-with-Algorithms-and-Data-Structures-using-Python/tree/master/graphs/dijkstra/priority-queue-impl-adjacency-map)