Update README.md (#3684)

README.md

@@ -62,9 +62,7 @@ See the [YOLOv5 Docs](https://docs.ultralytics.com) for full documentation on tr
 
 
 <details open>
-<summary>
-Install
-</summary>
+<summary>Install</summary>
 
 Python >= 3.6.0 required with all [requirements.txt](https://github.com/ultralytics/yolov5/blob/master/requirements.txt) dependencies installed:
 <!-- $ sudo apt update && apt install -y libgl1-mesa-glx libsm6 libxext6 libxrender-dev -->