Forgotten pytest plugins

Author: qxcv

setup.py

@@ -25,6 +25,8 @@
         "yapf~=0.30.0",
         "flake8~=3.8.3",
         "autoflake~=1.3.1",
+        "pytest-flake8~=1.0.6",
+        "pytest-isort~=1.1.0",
 
         # imitation needs special branch as of 2020-08-20
         ("imitation @ git+git://github.com/HumanCompatibleAI/imitation"