Add Konqueror-compability

Konqueror is a browser that may be worth detecting.

A user-agent string might look like this:
OpenBSD: `Mozilla/5.0 (compatible; Konqueror/4.1; OpenBSD) KHTML/4.1.4 (like Gecko)`
Windows: `Mozilla/5.0 (compatible; Konqueror/3.5; Windows NT 6.0) KHTML/3.5.6 (like Gecko)`
Linux: `Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.21 (KHTML, like Gecko) konqueror/4.14.3 Safari/537.21`