className property of Message component not working

[NathanPB]

I'm submitting a ... (check one with "x")

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

Codesandbox Case (Bug Reports)
https://codesandbox.io/s/primereact-test-mxkzk

Current behavior
The classes listed in the className property of any Message element are not included to the DOM.

Expected behavior
The custom classes listed in the className property should appear in the generated HTML.

Minimal reproduction of the problem with instructions

1. Create a primereact/Message component.
2. Add anything in its classList property
3. Run your project
4. Open the browser debugger and notice that your custom class is not included anywhere in the component

Please tell us about your environment:

• OS: OpenSuse Tumbleweed

• Node Version: v10.16.1

• NPM Version: 6.9.0

• Serve Version: 11.2.0

• React version: 16.9.0

• PrimeReact version: 3.3.2

• Browser: all

• Language: all

It's pretty much the same as #1068