hyperlink corrected

Author: ulf1

setup.py

@@ -11,7 +11,7 @@ def read(fname):
       description='Fractional Difference for Time Series',
       long_description=read('README.md'),
       long_description_content_type='text/markdown',
-      url='http://github.com/ulf1/fracdiff',
+      url='http://github.com/ulf1/numpy-fracdiff',
       author='Ulf Hamster',
       author_email='554c46@gmail.com',
       license='MIT',