Update Love is Over / Nyafuu

Nyafuu is suffering from extended downtime due to VoH's personal situation. I have picked up the boards that only Nyafuu hosted in this .json, and I removed Nyafuu from this list. It can be readded whenever Nyafuu comes back online.
update CHANGELOG.md
change private key location
Release 4chan X v1.8.7.2.
Move 4chan X v1.8.7.2 to stable channel.