Fixed forgetting a type

include/Tileset.h

@@ -14,7 +14,7 @@ namespace WalrusRPG
 
       public:
         Tileset(char *sheet, unsigned sheet_width, unsigned sheet_height, unsigned tile_width, unsigned tile_heihgt);
-        render_tile(unsigned int index, unsigned x, unsigned y) const;
+        void render_tile(unsigned int index, unsigned x, unsigned y) const;
     };
 }