"As a Curator, I want to get a count of the unique editors of a page, so that I can understand the diversity of contribution to the page."
GET /page/{title}/history/counts/editors
Return summary of information in the edit history.
Request body: none
Notable request headers: none
Status codes:
200 - OK
404 - no such page
Notable response headers: none
Body: JSON, object with following fields
count: total number of unique editors