update link for install_requires in setup.py
update link for install_requires in setup.py

Old link is 404'ing, new URL is linked to from https://python-packaging-user-guide.readthedocs.org/en/latest/distributing.html#install-requires
ESG-USA/python-sample-project,pypa/sampleproject,dbeal/xpy,adrianschlatter/sampleproject,dbeal/xpy,lucyking/pypi-project-kkk