I have a problem with implementing an Oauth2 authentication in node.js application where I need to add one extra parameter in the authorization request, but the module simply ignores the "unknown" parameters. 

My code is attached below. The parameter being ignored is `APIName`.

```
var OAuth2Strategy = require('passport-oauth2').Strategy;

// load the auth variables
var configAuth = require('./auth');

module.exports = function(passport) {

    passport.use('ihealth', new OAuth2Strategy({
            authorizationURL: 'https://api.ihealthlabs.com:8443/OpenApiV2/OAuthv2/userauthorization/',
            tokenURL: 'https://api.ihealthlabs.com:8443/OpenApiV2/OAuthv2/userauthorization/',
            clientID: configAuth.iHealthAuth.clientID,
            clientSecret: configAuth.iHealthAuth.clientSecret,
            callbackURL: configAuth.iHealthAuth.callbackURL,
            APIName : 'OpenApiActivity'
        },
        function(token, refreshToken, profile, done) {

            // ...

        }
    ));
};

```

The reason that I know `APIName` is being ignored, is that I see the URL in the browser:

```
https://api.ihealthlabs.com:8443/OpenApiV2/OAuthv2/userauthorization/?response_type=code&redirect_uri=SOMEREDIRECTURI&client_id=SOMECLIENTID

```

I am wondering how to enable adding extra parameters to the authorization request? Maybe by overriding the function `OAuth2Strategy.prototype.authorizationParams` in `node_modules/passport_oauth2/lib/strategy.js`, which looks like this in the donwloaded file:

```
/**
 * Return extra parameters to be included in the authorization request.
 *
 * Some OAuth 2.0 providers allow additional, non-standard parameters to be
 * included when requesting authorization.  Since these parameters are not
 * standardized by the OAuth 2.0 specification, OAuth 2.0-based authentication
 * strategies can overrride this function in order to populate these parameters
 * as required by the provider.
 *
 * @param {Object} options
 * @return {Object}
 * @api protected
 */
OAuth2Strategy.prototype.authorizationParams = function(options) {
  return {};
};

```