Update requirements.txt (#2021)

* Update requirements.txt

* Update ci-testing.yml

* Update hubconf.py

.github/workflows/ci-testing.yml

@@ -74,6 +74,7 @@ jobs:
           python test.py --img 128 --batch 16 --weights weights/${{ matrix.model }}.pt --device $di
           python test.py --img 128 --batch 16 --weights runs/train/exp/weights/last.pt --device $di
 
+          python hubconf.py  # hub
           python models/yolo.py --cfg models/${{ matrix.model }}.yaml  # inspect
           python models/export.py --img 128 --batch 1 --weights weights/${{ matrix.model }}.pt  # export
         shell: bash