gcp storage example out of date

[micahstubbs]

https://github.com/alexandersimoes/google-cloud-storage-node-boilerplate/blob/e29b93fadd6a66875085498d0959195bd56bdc89/index.js#L3

https://cloud.google.com/nodejs/docs/reference/storage/2.0.x/File.html#createWriteStream

the syntax now looks like:

const fs = require('fs');
const {Storage} = require('@google-cloud/storage');
const storage = new Storage();
const myBucket = storage.bucket('my-bucket');

const file = myBucket.file('my-file');