Update setup.py

setup.py

@@ -29,7 +29,7 @@ setup(name='activitypub',
       author='Douglas S. Blank',
       author_email='doug.blank@gmail.com',
       url='https://github.com/dsblank/activitypub',
-      install_requires=[],
+      install_requires=['jinja2'],
       packages=find_packages(include=['activitypub', 'activitypub.*']),
       include_data_files = True,
       test_suite = 'nose.collector',