Use new create_surface method in examples/transforms.rs (#43)

Author: catilac

examples/transforms.rs

@@ -15,9 +15,7 @@ fn sketch() -> error::Result<()> {
     let mut glfw_ctx = GlfwContext::new(400, 400)?;
     init()?;
 
-    let window_handle = glfw_ctx.get_window();
-    let display_handle = glfw_ctx.get_display();
-    let surface = surface_create(window_handle, display_handle, 400, 400, 1.0)?;
+    let surface = glfw_ctx.create_surface(400, 400, 1.0)?;
     let graphics = graphics_create(surface, 400, 400)?;
 
     let mut t: f32 = 0.0;