message: remove ferret/forest references
diff: @@ -8,10 +8,6 @@ edition = "2018"
  num = "0.2.1"
  anyhow = "1.0"
  -# FIXME: local source until ferret goes public
  -message = { path = "../../ferret/vm/message" }
  -address = { path = "../../ferret/vm/address" }
  -
  # FIXME: Check API compatibility
  parity-secp256k1 = "0.7.0"
  