activitystreams-history: Generate v1.11 context document

[trwnh]

Please Indicate One:

• [ ] Editorial
• [ ] Question
• [ ] Feedback
• [x] Blocking Issue
• [ ] Non-Blocking Issue

Please Describe the Issue:

The AS2 context currently contains two changes that are not included in the "latest" v1.10.

• The addition of alsoKnownAs expanded term definition
• The addition of the vcard prefix

These changes should be included in a "new" v1.11 hosted at https://www.w3.org/ns/activitystreams-history

[trwnh]

This appears to now be completed.