Generate dummy grammar include in release mode too.

The conditional was probably added because it was in the original
hint to do this manually in the documentation.  There doesn't seem
to be a downside since the constant will be thrown away in any
case, being unused.

Fixes #320.

generator/src/generator.rs

@@ -154,12 +154,11 @@ fn generate_builtin_rules() -> HashMap<&'static str, TokenStream> {
    builtins
}

// Needed because Cargo doesn't watch for changes in grammers.
// Needed because Cargo doesn't watch for changes in grammars.
fn generate_include(name: &Ident, path: &str) -> TokenStream {
    let const_name = Ident::new(&format!("_PEST_GRAMMAR_{}", name), Span::call_site());
    quote! {
        #[allow(non_upper_case_globals)]
        #[cfg(debug_assertions)]
        const #const_name: &'static str = include_str!(#path);
    }
}
@@ -904,7 +903,6 @@ mod tests {
            generate(name, &generics, Path::new("test.pest"), rules, defaults, true).to_string(),
            quote! {
                #[allow(non_upper_case_globals)]
                #[cfg(debug_assertions)]
                const _PEST_GRAMMAR_MyParser: &'static str = include_str!("test.pest");

                #[allow(dead_code, non_camel_case_types)]