feat: added bird, removed line in readme as it no longer applies

src/main.cpp

@@ -2,16 +2,18 @@
 #include <thread>
 #include "window.hpp"
 #include "input.hpp"
+#include "elements.hpp"
 
 int main() {
 	Window window;
 	Input input;
+	Bird bird;
 	bool running = true;
 
-	std::thread input_thread(&Input::get_input, &input, std::ref(running));
+	std::thread input_thread(&Input::get_input, &input, std::ref(running), std::ref(bird));
 	
 	while (running) {
-		window.update_display();
+		window.update_display(bird);
 	}
 
 	input_thread.join();