Update README.md

Fix missing character for proper running of command

Author: Dario Limongi

README.md

@@ -21,7 +21,7 @@ Another performance test is available [here](https://www.theimpossiblecode.com/b
 Install OpenCV library prerequisites on your Raspberry Pi.
 ```
 sudo apt-get update && sudo apt-get upgrade -y
-sudo apt-get install -y
+sudo apt-get install -y \
 	libjpeg-dev libpng-dev libtiff-dev libgtk-3-dev \
 	libavcodec-extra libavformat-dev libswscale-dev libv4l-dev \
 	libxvidcore-dev libx264-dev libjasper1 libjasper-dev \