Validation extension

update validation pb (#6)

* update validation pb

* update go package

Update pb

• http status as enum

Update rg.pb.go after showcase

• remove grpc_status
• rename option other_status into code, error_message into message

Update option auth and gateway_url

Changes:

• needauth and allowed_roles become auth
• gw_url become gateway_url
• use golang/protobuf v1.3.2

v1.0.5: Add extension (#1)

* Add extension

* Add go.mod