className parameter unsupported by Spinner component

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[x] bug report
[ ] feature request
[ ] support request => Please do not submit support request here, instead see https://forum.primefaces.org/viewforum.php?f=57

Plunkr Case (Bug Reports)

https://plnkr.co/edit/qqSX5kifO74fwWrN38QT?p=preview

Current behavior

Inserting a className parameter in a Spinner has no effect on how the Spinner is rendered, and the inserted class name does not appear on the DOM element.

Expected behavior

Inserting a className parameter in a Spinner has an effect on how the Spinner is rendered, and the inserted class name appears on the DOM element.

Minimal reproduction of the problem with instructions

See above Plunker

Please tell us about your environment:

Development in IntelliJ, execution on Webpack Dev Server and Glassfish

• React version:

16.4.2

• PrimeReact version:

2.0.0-beta.1

• Browser: [all | Chrome XX | Firefox XX | IE XX | Safari XX | Mobile Chrome XX | Android X.X Web Browser | iOS XX Safari | iOS XX UIWebView | iOS XX WKWebView ]

Tested in Chrome (latest), Firefox (latest) and IE 9

• Language: [all | TypeScript X.X | ES6/7 | ES5]
  ES6

How to fix
In Spinner.js, on line 391, change
let className = classNames("p-spinner p-component");
to
let className = classNames("p-spinner p-component", this.props.className);