Add initial Changelog file
Add initial Changelog file

This gathers commit messages from release tags, where possible, or else
from individual commits between tags, and formats them into a running file.
Not all releases are fully described, back-filling will be needed.

WP-API/node-wpapi,kadamwhite/wordpress-rest-api,kadamwhite/wordpress-rest-api,kadamwhite/wordpress-rest-api,WP-API/node-wpapi