fixed setup.py

setup.py

@@ -9,6 +9,6 @@ setup(name='bayespairing',
       license='McGill',
       packages=["bayespairing","bayespairing.src"],
       install_requires=[
-          "networkx", "matplotlib","seaborn","weblogo","ghostscript"
+          "networkx", "matplotlib","seaborn","weblogo","ghostscript","biopython"
       ],
       zip_safe=False)