Fix link to PyQt5 example

doc/releasenotes.rst

@@ -5,7 +5,7 @@ Version 1.7
 -----------
 
 * Support for downloading packages as wheels from PyPI, and new
-  `PyQt5 <https://github.com/takluyver/pynsist/tree/master/examples/pyqt>`__ and
+  `PyQt5 <https://github.com/takluyver/pynsist/tree/master/examples/pyqt5>`__ and
   `Pyglet <https://github.com/takluyver/pynsist/tree/master/examples/pyglet>`__
   examples which use this feature.
 * Applications can include commands to run at the Windows command prompt. See