message: removed "rinkeby" from core client readme invocation example
diff: @@ -27,7 +27,7 @@ const client = new PolywrapCoreClient(config);
  ```ts
  await client.invoke({
  - uri: "ens/rinkeby/helloworld.dev.polywrap.eth",
  + uri: "ens/helloworld.dev.polywrap.eth",
  method: "logMessage",
  args: {
  message: "Hello World!"
  