Add missing dependencies to ethereum_jsonrpc

apps/ethereum_jsonrpc/mix.exs

@@ -87,7 +87,9 @@ defmodule EthereumJsonrpc.MixProject do
       # `:verify_fun` for `Socket.Web.connect`
       {:ssl_verify_fun, "~> 1.1"},
       # `EthereumJSONRPC.WebSocket`
-      {:websocket_client, "~> 1.3"}
+      {:websocket_client, "~> 1.3"},
+      {:decimal, "~> 1.0"},
+      {:decorator, "~> 1.2"}
     ]
   end
 end