Update ci-testing.yml reflecting sys.path additions (#869)

* Update ci-testing.yml

* Update yolo.py

* Update ci-testing.yml

* Update export.py

* Update yolo.py

models/export.py

@@ -5,13 +5,13 @@ Usage:
 """
 
 import argparse
+import sys
+
+sys.path.append('./')  # to run '$ python *.py' files in subdirectories
 
 import torch
 import torch.nn as nn
 
-import sys
-sys.path.append('./')
-
 import models
 from models.experimental import attempt_load
 from utils.activations import Hardswish