Get A Previous Revision Of A Snippet

Identical to `GET /snippets/encoded_id`, except that this endpointcan be used to retrieve the contents of the snippet as it was at anolder revision, while `/snippets/encoded_id` always returns thesnippet's current revision.Note that only the snippet's file contents are versioned, not itsmeta data properties like the title.Other than that, the two endpoints are identical in behavior.