Merge pull request #246 from njustesen/fix/gym-version

Hotfix to gym version issue

Author: njustesen

setup.py

@@ -38,7 +38,7 @@
           'numpy',
           'untangle',
           'Flask',
-          'gym',
+          'gym==0.21.0',
           'Jinja2',
           'python-interface',
           'stopit',