Fix #15 change homepage url to Github (#16)

According to documentation in the packaging tutorial the url should
be a reference to the code hosting service.

Signed-off-by: David Brown <dmlb2000@gmail.com>

Author: dmlb2000

setup.py

@@ -16,7 +16,7 @@
     use_scm_version=True,
     setup_requires=['setuptools_scm'],
     license='LGPLv3',
-    url='https://pypi.python.org/pypi/jsonpath2/',
+    url='https://github.com/pacifica/python-jsonpath2/',
     description='JSONPath implementation for Python',
     long_description=open(path.join(
         path.abspath(path.dirname(__file__)),