can't build for web?

Thanks for a great product. Successfully built my first project and deployed for android and ios emulator. I wanted to deploy for local web testing, but no luck getting it to run

$ expo --version

$ expo --web
  error: unknown option `--web'

$ yarn web
yarn run v1.13.0
$ expo start --web

  error: unknown option `--web'

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Your version of expo-cli is too old. You’ll need to upgrade it.

This is normally done as follows:

npm install -g expo-cli

If you originally installed expo-cli using yarn, then you should do the following instead:

yarn global add expo-cli

Note: globally installed stuff (like expo-cli) and your app’s dependencies (listed in package.json) are separate from each other, so it is not uncommon to use npm to install the global stuff and yarn to install the app’s dependencies.

If you’re not sure whether you installed expo-cli using npm or yarn originally you could try this:

npm uninstall -g expo-cli
yarn global remove expo-cli
npm install -g expo-cli
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