message: Re-add serde_json to dev deps
diff: @@ -54,6 +54,7 @@ env_logger = "0.8.1"
  nats_test_server = { path = "nats_test_server" }
  quicli = "0.4.0"
  serde = { version = "1.0.114", features = ["derive"] }
  +serde_json = "1.0.56"
  structopt = "0.3.15"
  historian = "4.0"
  lazy_static = "1.4"
  