fix deprecated bindgen usage

Author: berquist

build.rs

@@ -11,7 +11,7 @@ fn main() {
     println!("cargo:rustc-link-lib=static=pyquante2");
     let bindings_libpyquante2 = bindgen::Builder::default()
         .header("libpyquante2/cints.h")
-        .parse_callbacks(Box::new(bindgen::CargoCallbacks))
+        .parse_callbacks(Box::new(bindgen::CargoCallbacks::new()))
         .generate()
         .expect("Unable to generate bindings");
     bindings_libpyquante2