update README

README.md

@@ -5,23 +5,20 @@ Playground for different analogue stick setups written with SDL2 for graphics an
 ### Building ###
 Requirements:
 - C99 compiler
-- SDL 2.x
-- CMake 3.1 or higher
+- SDL 3.0.0
+- CMake 3.5 or higher
+
+Optional:
+- Python 3 (Only when building OpenGL Core profile or Metal backends)
+- Fruit device (Only for Metal backend)
 
 Available backends are:
 - `BUILD_OPENGL_LEGACY` OpenGL Compatibility profile 1.1 (default ON)
 - `BUILD_OPENGL` OpenGL Core profile 3.3 (WIP)
 - `BUILD_METAL` Fruit renderer (WIP, ON by default for APPLE)
 
-OpenGL Core profile backend requires:
-- Python 3
-
-Metal backend requires:
-- Fruit device
-- Python 3
-
 For *nix:
 ```shell
-cmake -B build -DCMAKE_BUILD_TYPE=RelWithDebInfo
+cmake -GNinja -B build -DCMAKE_BUILD_TYPE=RelWithDebInfo -DBUILD_OPENGL:BOOL=ON
 cmake --build build
 ```