Added scipy to the required packages.

setup.py

@@ -4,7 +4,7 @@ setup(
     name="grext",
     version="0.1.0",
     packages=find_packages(),
-    install_requires=["numpy"],
+    install_requires=["numpy", "scipy"],
     author="Michele Nottoli",
     description="Tools for generating new guesses for SCF calculations.",
     classifiers=[