Update raylib badge to 4.6

Author: RobLoach

README.md

@@ -1,6 +1,6 @@
 ![raylib-cpp Logo](projects/Doxygen/raylib-cpp_256x256.png)
 
-# raylib-cpp ![Targeting raylib 4.5](https://img.shields.io/badge/for_raylib-4.5-blue) [![Tests](https://github.com/RobLoach/raylib-cpp/workflows/Tests/badge.svg)](https://github.com/RobLoach/raylib-cpp/actions?query=workflow%3ATests+branch%3Amaster) [![License](https://img.shields.io/badge/license-zlib%2Flibpng-blue.svg)](LICENSE)
+# raylib-cpp ![Targeting raylib 4.6](https://img.shields.io/badge/for_raylib-4.5-blue) [![Tests](https://github.com/RobLoach/raylib-cpp/workflows/Tests/badge.svg)](https://github.com/RobLoach/raylib-cpp/actions?query=workflow%3ATests+branch%3Amaster) [![License](https://img.shields.io/badge/license-zlib%2Flibpng-blue.svg)](LICENSE)
 
 [raylib-cpp](https://github.com/robloach/raylib-cpp) is a C++ wrapper library for [raylib](https://www.raylib.com), a simple and easy-to-use library to enjoy videogames programming. This C++ header provides object-oriented wrappers around *raylib*'s struct interfaces. *raylib-cpp* is not required to use *raylib* in C++, but the classes do bring using the raylib API more inline with C++'s language paradigm.