:memo: Add missing sdl image dependency

README.md

@@ -10,7 +10,7 @@ You need `make` and `SDL1` to build this project.
 
 Example on Ubuntu :
 ```sh
-$ sudo apt install make g++ libsdl-dev libsdl-ttf2.0-dev
+$ sudo apt install make g++ libsdl-dev libsdl-ttf2.0-dev libsdl-image1.2-dev
 $ make
 ```