Add extended AuthenticateOptions interface to passport-facebook

This is useful since passing options with authType to passport's
authenticate method fails since passport itself doesn't know about
it. You can use this extended instead to retype it to the one that
this method supports instead.

passport-facebook/index.d.ts

@@ -19,6 +19,10 @@ interface Profile extends passport.Profile {
     _json: any;
 }
 
+export interface AuthenticateOptions extends passport.AuthenticateOptions {
+    authType?: string;
+}
+
 interface IStrategyOption {
     clientID: string;
     clientSecret: string;