Update README.md

Author: Myzhar

README.md

@@ -18,6 +18,8 @@ This package lets you use the ZED stereo camera with ROS. It outputs the camera
 - [ZED SDK **≥ 3.5**](https://www.stereolabs.com/developers/) and its dependency [CUDA](https://developer.nvidia.com/cuda-downloads)
 - [ROS Noetic](http://wiki.ros.org/noetic/Installation/Ubuntu)
 
+or
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 - Ubuntu 18.04
 - [ZED SDK **≥ 3.5**](https://www.stereolabs.com/developers/) and its dependency [CUDA](https://developer.nvidia.com/cuda-downloads)
 - [ROS Melodic](http://wiki.ros.org/melodic/Installation/Ubuntu)