Updating setup.py for patch

READMEPYPI.md

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+`hazma` is a tool for analyzing theories of sub-GeV dark matter. It can compute gamma-ray spectra from dark matter 
+annihilations, set limits using current gamma-ray data and make projects for future gamma-ray detectors. It can generate 
+positron spectra as well, and derive accurate CMB constraints. `hazma` includes several pre-implemented sub-GeV dark 
+matter models, and provides the infrastructure to add custom ones. Visit https://github.com/LoganAMorrison/Hazma or 
+https://hazma.readthedocs.io for more information.
+
+`hazma` can be installed from PyPI using:
+
+    pip install hazma
+
+Alternatively, you can download `hazma` directly from this page, navigate to the package directory using the command line and run
+
+    pip install .
+
+or
+
+    python setup.py install
+
+Since `hazma` utilizes C to rapidly compute gamma ray, electron and positron spectra, you will need to have the `cython` package installed.