Updated setup.py

setup.py

@@ -14,7 +14,8 @@ setup(name='westpy',
           'matplotlib',
           'datetime',
           'requests', 
-          'mendeleev'
+          'mendeleev', 
+          'signac'
       ],
-      python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, <4',
+      python_requires='>=3.0, !=3.0.*, !=3.1.*, !=3.2.*, <4',
       zip_safe=True)