Point to new version of npm package

[johanbrandhorst]

Part of improbable-eng/grpc-web#289

[jonny-improbable]

Thanks @johanbrandhorst; build is failing because the examples need to be re-generated, please could you run ./generate.sh and check in the changed files?

Also, from looking at the package.json file I can see that it incldues grpc-web-client as a devDependency; please could you run the following commands in the root of the repo:

nvm use  # to ensure you are using the node/npm version specified in `.npmrc`
npm rm grpc-web-client
npm install @improbable-eng/grpc-web

Thanks!

[johanbrandhorst]

Had to run yarn remove and yarn add as well but I think I got all of them now!

[johanbrandhorst]

This is my markdown formatter, prettier, I can remove these changes if you want.

[jonny-improbable]

LGTM, Thanks :)