Revert "Update popit-api"
Revert "Update popit-api"

This reverts commit 629f21925a049151219268193ab1208a52704329.

mysociety/popit,Sinar/popit,Sinar/popit,mysociety/popit,mysociety/popit,Sinar/popit,mysociety/popit,openstate/popit,openstate/popit,Sinar/popit,openstate/popit,openstate/popit,mysociety/popit