Removed incorrect role attribute on popoverDiv

[lex-rmondal]

See allowed aria roles states and properties

[lex-rmondal]

What are the issues solved by that?

Maybe, you should send a PR to the maintained fork at https://github.com/virtualidentityag/ng2-popover

Hey @koppor, do you publish your fork in npm? I need a published version of this repository.

Coming to the changes, role = "popover" is an invalid role attribute which will cause accessibility issue when using screen reader.

[koppor]

No, I have no intentions to publish my fork (@koppor). Could you talk to @virtualidentityag? I assume, he is open to publish it on GitHub.