Breadcrumb component throws warning

[vickyvxr]

I'm submitting a ...

[x ] bug report
[ ] feature request
[ ] support request 

**Current behavior**
Adding a breadcrumb component throws a warning :
index.js:2178 Warning: Invalid DOM property `class`. Did you mean `className`?

**Expected behavior**
No warning is thrown when adding a primereact component

* **React version:**
"react": "^16.4.0",

* **PrimeReact version:**
"primereact": "^2.0.0-beta.1",

* **Browser:** 
Chrome
 
* **Language:** [all | TypeScript X.X | ES6/7 | ES5]
ES6

You can browse your code in github:
https://github.com/primefaces/primereact/blob/master/src/components/breadcrumb/BreadCrumb.js
Line 70 has class= instead of className=