Fix requirements typo

Norbert Kozlowski · Norbert Kozlowski · commit fb92aacb3b93 · 2018-10-14T11:23:13.000+02:00
diff --git a/setup.py b/setup.py
@@ -10,7 +10,7 @@
       license='MIT',
       packages=find_packages(),
       install_requires=[
-          'numpy'
+          'numpy',
           'gym>=0.10',
           'networkx==2.0',
           'bitstring==3.1.5'
