As there are [more tags](https://developers.facebook.com/docs/messenger-platform/send-messages/message-tags) being added, can we remove the validations on tags ([here](https://github.com/ShellMonkeys/fb-messenger-es6/blob/577788e2d98833a57314db57f452b68fc3702414/src/message/templates/genericTemplate.js#L47) & [here](https://github.com/ShellMonkeys/fb-messenger-es6/blob/51c4fadb9750dd2642c6d3f48f57395c17c4c887/src/message/contentTypes/textMessage.js#L17))?
