Survey endpoint

For CSAT

Update to guzzle version 7.0.1

Merge pull request #3 from hussaini/upgrade-guzzle-http

Upgrade `guzzlehttp/guzzle` to `^7.0.1`

Options when initialize API

Merge pull request #2 from hussaini/client-options

Add optional `$options` parameter when initialize `Api` class

New Release

Use $sdk->results to get result and $sdk->headers to get headers