Add psutil and ipython to requirements.txt (ultralytics#7998)

* Add `psutil` and `ipython` to requirements.txt

Lightweight packages used by YOLOv5 for system utilization (psutil) and interactive notebooks (IPython)

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requirements.txt

@@ -32,7 +32,9 @@ onnx-simplifier>=0.3.6  # ONNX simplifier
 openvino-dev  # OpenVINO export
 
 # Extras --------------------------------------
+ipython  # interactive notebook
+psutil  # system utilization
+thop  # FLOPs computation
 # albumentations>=1.0.3
 # pycocotools>=2.0  # COCO mAP
 # roboflow
-thop  # FLOPs computation