Update README.md

Author: lachsdachs

README.md

@@ -31,7 +31,7 @@ extern crate glfw;
 use glfw::{Action, Context, Key};
 
 fn main() {
-    let mut glfw = glfw::init(glfw::FAIL_ON_ERRORS).unwrap();
+    let mut glfw = glfw::init(glfw::fail_on_errors).unwrap();
 
     let (mut window, events) = glfw.create_window(300, 300, "Hello this is window", glfw::WindowMode::Windowed)
         .expect("Failed to create GLFW window.");