Fix copy with formatting for IE

[wdlb]

Hi! When using react-copy-to-clipboard, which is using this copy-to-clipboard module, I've encountered an issue in IE11.

In the function that was attached to the "copy" event using the mark.addEventListener("copy", function(e) { ... }) an error is thrown in IE11 due to the e.clipboardData being undefined. There's a try/catch present, but we do not end up in the catch block due to the fact that the error is thrown inside of the callback attached to the "copy" event and not inside of the root level function copy(text, options) { ... }.

I fixed this by checking explicitly if the e.clipboardData is undefined, and using the window.clipboardData if this is the case. I had to add some conversion of options as well, as per: https://msdn.microsoft.com/en-us/ie/ms536744(v=vs.94).

Could you have a look at this please? Thanks a lot!

[wdlb]

This PR should solve this issue as well: #84

[sudodoki]

At glance, looks good. Let me get back to this when I get time to do the release as well

[sudodoki]

And thanks 🙏

[wdlb]

You're welcome, thank you for all the time you have invested in this library! I've seen that the travis-ci build failed, should I do something about it? Because it's not entirely clear to me why exactly. Have a nice day!

[sudodoki]

@wdlb no, you are good, it originally failed due to some inconsistencies between browsers, and I guess now it's because saucelab account expired or something like that.