Arguments for blobs.get

[retog]

According to https://ssbc.github.io/scuttlebutt-protocol-guide/#fetching a valid argument for blobs.get would be

{"hash":"&KYWW5Lblhq2moFO9BJhtJ5WukFRpA7eYybOwdODTt3M=.sha256","max":5242880}

However, the reference implementation is sending

{"key":"&KYWW5Lblhq2moFO9BJhtJ5WukFRpA7eYybOwdODTt3M=.sha256","max":5242880}

see: ssbc/ssb-blobs@c394333

[arj03]

Looks correct, can you provide a PR? Looks like getSlice also needs an update?