Example on front-page is broken

[purew]

Example code gives two arguments to generator::generate but it takes three:

error[E0061]: this function takes 3 parameters but 2 parameters were supplied
  --> validate-lua/src/build.rs:8:18
   |
8  |       let output = generator::generate(
   |  __________________^
9  | |         &env::current_dir().unwrap().as_path().join("src/lib.rs"),
10 | |         "example_setup",
11 | |     );
   | |_____^ expected 3 parameters

error: aborting due to previous error