Update README.md

Author: johspaeth

README.md

@@ -5,6 +5,6 @@
 This repository contains an implementation of an algorithm by Tarjan that efficiently computes path expressions based on a labeled graph.
 A path expression is a regular expression describing all path between two nodes in the labeled graph.
 
-The implementation is according to what is described in the paper:
+The implementation is according to the paper:
 
 [Fast Algorithms for Solving Path Problems](https://dl.acm.org/citation.cfm?id=322273)