Tab: browser throwing a warning - getInitialState

[Edrees]

Steps to Reproduce

1. Using the Tab component and importing it to my page

Expected
The Tab should do this: there shouldn't be any errors or warnings

Result
The Tab does not do this: the browser gives a warning:

Warning: getInitialState was defined on Tab, a plain JavaScript class. This is only supported for classes created using React.createClass. Did you mean to define a state property instead?

The Tab.js (in the semantic-ui-react node_module) is using getInitialState which is not used in ES6

getInitialState() {
    return { activeIndex: 0 }
}

Could you please help me with this if there is a way to fix this or is changing the syntax to ES6 by using constructor and assigning the state is the only way to go?
Thanks!

Testcase
If the docs show the issue, use: https://react.semantic-ui.com/modules/tab#tab-example-secondary-pointing
Otherwise, fork this to get started: http://codepen.io/levithomason/pen/ZpBaJX

[layershifter]

What version of React do you use?

[Edrees]

"react": "15.5.4"

[layershifter]

Hm, I can't reproduce this on 15.5, however warning really exists on 15.4.

I will make PR.

[Edrees]

Thanks for your prompt responses! I tried if I can get rid of it by updating react to "15.6.1", but it didn't work and I still have the problem.

[Edrees]

@layershifter @levithomason you guys are awesome and thanks for picking up this so fast and fixing it 👍