meta missing from role:transport,type:balance,add:client

[tswaters]

I'm creating a monitor for mesh, and would like to listen for when pins are added/removed.

I'm able to hook into role:transport,type:balance,remove:client and role:transport,type:balance,add:client, and can for the most part get the same result that role:mesh.get:members responds with.

However, the add, action is missing the meta key, so I can't pick out the instance.... this same key is present on remove. For consistency's sake, this would be good to include.