Alert on modification to allocator multisigs

[willscott]

if the multisig that is registered in one of the active allocator's has it's signatories changed, we should file an issue against the allocator-registry registry reflecting the change

[willscott]

Note: will need access to the allocator-registry repo in order to make comments there

[willscott]

This may need to be a different service/app that is operated by governance team - we need to confirm that requirement before we can be sure this is okay to add to the current app