Fix Gazebo Robotics

Signed-off-by: methylDragon <methylDragon@gmail.com>

README.md

@@ -15,7 +15,7 @@ Homebrew      | [![Build Status](https://build.osrfoundation.org/buildStatus/ico
 Windows       | [![Build Status](https://build.osrfoundation.org/buildStatus/icon?job=ign_physics-ci-win)](https://build.osrfoundation.org/job/ign_physics-ci-win)
 
 Gazebo Physics, a component of [Gazebo
-Robotics](https://gazebosim.org), provides an abstract physics interface
+Sim](https://gazebosim.org), provides an abstract physics interface
 designed to support simulation and rapid development of robot applications.
 
 # Table of Contents