Fix/pytest asyncio degrade (#223)

Fix the "Task pending" RuntimeError

Author: yammesicka

requirements.txt

@@ -57,7 +57,7 @@ pycodestyle==2.6.0
 pydantic==1.7.3
 pyflakes==2.2.0
 pyparsing==2.4.7
-pytest-asyncio==0.14.0
+pytest-asyncio<0.14.0
 pytest-cov==2.10.1
 pytest-forked==1.3.0
 pytest-mock==3.5.1