fix https://github.com/kataras/iris/issues/879 by @martinnagelberg

Former-commit-id: 171480e3cb0b172d8f28eb95a36c97f926836810

middleware/basicauth/basicauth.go

@@ -42,6 +42,7 @@ func New(c Config) context.Handler {
 		config.Realm = c.Realm
 	}
 	config.Users = c.Users
+	config.Expires = c.Expires
 
 	b := &basicAuthMiddleware{config: config}
 	b.init()