address warnings in athenz-auth-core-nodejs build

[havetisyan]

[INFO] npm install
[INFO] npm WARN deprecated [email protected]: CoffeeScript on NPM has moved to "coffeescript" (no hyphen)
[INFO] npm WARN deprecated [email protected]: Please update to minimatch 3.0.2 or higher to avoid a RegExp DoS issue
[INFO] npm WARN deprecated [email protected]: Please update to minimatch 3.0.2 or higher to avoid a RegExp DoS issue
[INFO] npm WARN deprecated [email protected]: please upgrade to graceful-fs 4 for compatibility with current and future versions of Node.js
[INFO] npm WARN deprecated [email protected]: This package is unmaintained. Use @sinonjs/formatio instead

@tatyano can you please take a look at this one as well. thanks.

[ctyano]

We'll take a look. thank you.