[Standards] UPDATED REGISTRY: FORM_TYPEs for Data Forms

[XMPP Registrar]

The FORM_TYPEs for Data Forms registry has been updated.

Version: 0.8

Changelog: Added CAPTCHA form type and CAPTCHA-related fields for registration 
form type. (psa)

URL: http://www.xmpp.org/registrar/formtypes.html