Update jquery

[bvenners]

Hi Chee Seng,

We got this notice about jquery:

https://github.com/scalatest/scalactic-website/network/alert/public/scaladoc/3.0.0/lib/jquery.js/jquery/open

Please update it to an appropriate later version, 1.9.0 or later.

Thanks.

Bill

[cheeseng]

@bvenners As we discussed, this is in the older scaladoc and we think it should be safer to re-generate the scaladoc with Scala 2.12.11, which will use jquery 3.x.