Bug report for Cloudinary NPM SDK

Describe the bug in a sentence or two.

Have been using Cloudinary uploader the same way for a long time, just within the past few days I am now getting: Upload preset must be specified when using unsigned upload

Even though I am passing in these at the options to the uploader:

If you need the full name I can give, just wasn't sure if that could be sensitive at all.

Issue Type (Can be multiple)

[ ] Build - Can’t install or import the SDK
[ ] Babel - Babel errors or cross browser issues
[X] Performance - Performance issues
[X] Behaviour - Functions aren’t working as expected (Such as generate URL)
[ ] Documentation - Inconsistency between the docs and behaviour
[ ] Incorrect Types - For typescript users who are having problems with our d.ts files
[ ] Other (Specify)

Steps to reproduce

Using uploader.upload_stream pass in options that include a upload_preset, returns error: Upload preset must be specified when using unsigned upload

Versions and Libraries (fill in the version numbers)

Cloudinary_NPM SDK version
Node - 2.6.0 & 2.6.1
NPM - 2.6.0 & 2.6.1