Update README.md

Under dependencies changed Dear ImGui supported versions

Author: salmonsushi47

README.md

@@ -17,7 +17,7 @@ Dependencies
 -----
 
 * [SFML](https://github.com/SFML/SFML) >= 3.0.0
-* [Dear ImGui](https://github.com/ocornut/imgui) >= 1.91.1
+* [Dear ImGui](https://github.com/ocornut/imgui) >= 1.91.1, < 1.92.0
 
 Contributing
 -----