README.md: Update dependencies.

README.md

 
 ### Install using CMake (Requires CMake)
 
-*Note: Dependencies should be installed first: libxext, imlib2, mesa, libxrender, libxrandr, and glew.*
+*Note: Dependencies should be installed first: libxext, imlib2, mesa, libxrender, libxrandr, glew and glm.*
 
 ```bash
 git clone https://github.com/naelstrof/slop.git