Update README.md (#270)

* Update README.md

Ubuntu 18.04 also required the extra packages as mentioned under WSL, consolidating into one place.

* Add note to follow linux-specific instructions

* Update README.md

README.md

@@ -39,6 +39,8 @@ Install the following packages with your package manager of choice:
 * `libpng-dev`
 * `libbz2-dev`
 * `m4`
+* `xorg-dev`
+* `libglu1-mesa-dev`
 
 #### For `Windows` native
 
@@ -48,7 +50,7 @@ No additional dependencies needed.
 
 #### For `Windows` Subsystem for Linux (`WSL`)
 
-- `sudo apt install libpng-dev libbz2-dev m4 xorg-dev libglu1-mesa-dev`
+Make sure to check the specific requirements for your Linux distribution, above.
 
 > __NOTE:__ Hardware acceleration is not enabled by default in WSL (instead, WSL will fall-back to a _software_ renderer). This is problematic for performance - for that reason, we recommend building and running Revery natively on Windows instead of with WSL. For more info see: (https://github.com/Microsoft/WSL/issues/637 and a [potential workaround](https://superuser.com/questions/1238925/use-accelerated-graphics-on-windows-10-linux-subsystem-with-xming))