Use CargoCallbacks::new() in tutorial

Author: george-hopkins

book/src/tutorial-3.md

@@ -21,9 +21,6 @@ fn main() {
     // shared library.
     println!("cargo:rustc-link-lib=bz2");
 
-    // Tell cargo to invalidate the built crate whenever the wrapper changes
-    println!("cargo:rerun-if-changed=wrapper.h");
-
     // The bindgen::Builder is the main entry point
     // to bindgen, and lets you build up options for
     // the resulting bindings.
@@ -33,7 +30,7 @@ fn main() {
         .header("wrapper.h")
         // Tell cargo to invalidate the built crate whenever any of the
         // included header files changed.
-        .parse_callbacks(Box::new(bindgen::CargoCallbacks))
+        .parse_callbacks(Box::new(bindgen::CargoCallbacks::new()))
         // Finish the builder and generate the bindings.
         .generate()
         // Unwrap the Result and panic on failure.