[skip ci] Update README.md

Author: stepjam

README.md

@@ -19,9 +19,9 @@ __PyRep is a toolkit for robot learning research, built on top of [CoppeliaSim](
 ## Install
 
 PyRep requires version **4.1** of CoppeliaSim. Download: 
-- [Ubuntu 16.04](https://www.coppeliarobotics.com/files/CoppeliaSim_Edu_V4_1_0_Ubuntu16_04.tar.xz)
-- [Ubuntu 18.04](https://www.coppeliarobotics.com/files/CoppeliaSim_Edu_V4_1_0_Ubuntu18_04.tar.xz)
-- [Ubuntu 20.04](https://www.coppeliarobotics.com/files/CoppeliaSim_Edu_V4_1_0_Ubuntu20_04.tar.xz)
+- [Ubuntu 16.04](https://www.coppeliarobotics.com/files/V4_1_0/CoppeliaSim_Edu_V4_1_0_Ubuntu16_04.tar.xz)
+- [Ubuntu 18.04](https://www.coppeliarobotics.com/files/V4_1_0/CoppeliaSim_Edu_V4_1_0_Ubuntu18_04.tar.xz)
+- [Ubuntu 20.04](https://www.coppeliarobotics.com/files/V4_1_0/CoppeliaSim_Edu_V4_1_0_Ubuntu20_04.tar.xz)
 
 Once you have downloaded CoppeliaSim, you can pull PyRep from git: