Update setup.py name.

Author: mfitzp

setup.py

@@ -5,7 +5,7 @@
 setup(
     name='qtwidgets',
     version=version,
-    url='http://github.com/learnpyqt/qtwidgets,
+    url='http://github.com/learnpyqt/python-qtwidgets,
     author='Martin Fitzpatrick',
     author_email='martin.fitzpatrick@gmail.com',
     description='Custom widget library for PyQt5 and PySide2 (Qt for Python). Free to use in your own applications.',