func (mx *Mux) Patch(pattern string, handlerFn http.HandlerFunc) {
	mx.handle(mPATCH, pattern, handlerFn)
}
func (mx *Mux) Patch(pattern string, handlerFn http.HandlerFunc) {
	mx.handle(mPATCH, pattern, handlerFn)
}
// Patch adds the route `pattern` that matches a PATCH http method to
// execute the `handlerFn` http.HandlerFunc.