Update setup.py

setup.py

@@ -207,6 +207,7 @@ def setup_package():
             # Setuptools 18.0 properly handles Cython extensions.
             'setuptools>=18.0',
             'cython',
+            'matplotlib',
             'numpy',
             'pytest-runner'
         ],
@@ -218,6 +219,7 @@ def setup_package():
             'setuptools>=18.0',
             'cython',
             'numpy',
+            'matplotlib',
             'docutils>=0.3',
             'six>=1.10',
             'Sphinx',