message: Readme: needs internet to build locally (-dev)
  closes
diff: @@ -132,7 +132,7 @@ $ wrangler publish
  `wrangler dev` works very similarly to `wrangler preview` except that instead of opening your browser to preview your worker, it will start a server on localhost that will execute your worker on incoming HTTP requests. From there you can use cURL, Postman, your browser, or any other HTTP client to test the behavior of your worker before publishing it.
  - You should run wrangler dev from your worker directory, and if your worker makes any requests to a backend, you should specify the host with `--host example.com`.
  + You should run wrangler dev from your worker directory, and if your worker makes any requests to a backend, you should specify the host with `--host example.com`. You need to be online while building, as part of the build process happens on our servers (even though the actual server is on localhost).
  From here you should be able to send HTTP requests to `localhost:8787` along with any headers and paths, and your worker should execute as expected. Additionally, you should see console.log messages and exceptions appearing in your terminal.
  