Pin this dependency in this test. We should also figure out what's going wrong

test/extra/cheetah_test.py

@@ -4,7 +4,7 @@ sys.path.append(os.path.dirname(__file__) + "/../lib")
 from test_helper import create_virtenv, run_test
 
 ENV_NAME = os.path.abspath("cheetah_test_env_" + os.path.basename(sys.executable))
-create_virtenv(ENV_NAME, ["cheetah==2.4.4"], force_create = True)
+create_virtenv(ENV_NAME, ["cheetah==2.4.4", "Markdown==2.0.1"], force_create = True)
 
 cheetah_exe = os.path.join(ENV_NAME, "bin", "cheetah")
 env = os.environ