Add "json-rpc": "2.0"

src/api/transports/http.js

@@ -11,6 +11,7 @@ export default class HttpTransport extends Transport {
     const id = data.id || this.id++;
     const payload = {
       id,
+      "json-rpc": '2.0',
       method: data.method,
       params: data.params,
     };