Title attribute on events doesn't escape HTML tags

[pascalchevrel]

Hi,

First of all thanks for your library :)

I got a user reporting a bug to me which is that the tooltips that appear when hovering over an event has escaped HTML displayed if the event has html injected in it (in my case, a <br> line break). See the screenshot:

I have a local patch, I'll make a PR.

Cheers
Pascal

[benhall14]

Thanks for updating this :)