fixed error in setup.py

Author: Ken McMillan

setup.py

@@ -8,7 +8,7 @@
       author_email='nomail@example.com',
       license='MIT',
       packages=find_packages(),
-      include_package_data={'ivy':['include/*.ivy','include/*.h']}
+      package_data={'ivy':['include/*.ivy','include/*.h']},
       install_requires=[
           'ply',
           'pygraphviz',