Failed to load requirements.txt on Windows with dockerizePip set to false

[PatrickBuTaxdoo]

The sls deploy command fails if dockerizePip is set to false while using a windows system:

Could not open requirements file: [Errno 22] Invalid argument: 'C\\:\\\\Users\\\\[...]\\\\.serverless\\\\requirements\\\\requirements.txt'

There are way too many slashes. I think the error originates from this function in lib/pip.js:

function dockerPathForWin(options, path) {
  if (process.platform === 'win32' && options.dockerizePip) {
    return path.replace(/\\/g, '/');
  }
  return quote_single(path);
}

It should instead look like this:

function dockerPathForWin(options, path) {
  if (process.platform === 'win32') {
    return path.replace(/\\/g, '/');
  }
  return quote_single(path);
}

[dschep]

That's probably right. Did you test this change? Either way, feel free to make a PR. I'll cut a release if this fix is confirmed, but I don't have a windows box.