fix(derive): use full path to trait

Author: aqrln

example/src/lib.rs

@@ -3,7 +3,7 @@ extern crate napi;
 #[macro_use]
 extern crate napi_derive;
 
-use napi::{NapiArgs, NapiEnv, NapiNumber, NapiResult, NapiUndefined};
+use napi::{NapiEnv, NapiNumber, NapiResult, NapiUndefined};
 
 #[derive(NapiArgs)]
 struct HelloArgs;

napi-derive/src/lib.rs

@@ -81,7 +81,7 @@ fn impl_napi_args(
     };
 
     Ok(quote! {
-        impl<'env> NapiArgs<'env> for #name #gen_lifetime {
+        impl<'env> ::napi::NapiArgs<'env> for #name #gen_lifetime {
             fn from_cb_info(
                 env: & #ref_lifetime ::napi::NapiEnv,
                 cb_info: ::napi::sys::napi_callback_info,