keys.go
func (a *KeyService) Update(ctx context.Context, sid string, data url.Values) (*Key, error) {
	key := new(Key)
	err := a.client.UpdateResource(ctx, keyPathPart, sid, data, key)
	return key, err
}
func (a *KeyService) Update(ctx context.Context, sid string, data url.Values) (*Key, error) {
	key := new(Key)
	err := a.client.UpdateResource(ctx, keyPathPart, sid, data, key)
	return key, err
}
// Update the key with the given data. Valid parameters may be found here:
// https://www.twilio.com/docs/api/rest/keys#instance-post