updated the pyqt4 installation link

README.md

@@ -9,5 +9,5 @@ Installing
 -------------------
 Dota Counter Picker requires at least [python 2.7][2] and [pyQt4][3], and all associated libraries. Follow the pyQt4 installation guide. Everything else should work without additional installations. For full functionality, make sure HeroList.txt is up to date. If you make a change to the HeroList, delete data.csv and update the data by clicking File>Update Data (should take about 2 minutes to update depending on internet speeds).
   [2]: https://www.python.org/download/releases/2.7/
-  [3]: http://pyqt.sourceforge.net/Docs/PyQt4/installation.html
+  [3]: http://www.riverbankcomputing.com/software/pyqt/download