Currently Linkifier implimentation could not linkify the URL with super-long TLDs.

Linkifier assume the TLD lenght in 2 - 6 chars in the here,
https://github.com/sourcelair/xterm.js/blob/master/src/Linkifier.ts#L14

But, some new gTLDs have over 6 chars. (ex: .enterprises, .foundation, and so on).
Needs to update tldClause to support these super-long TLD names.

Details

• xterm.js version: master (ff29fd6)

Steps to reproduce

1. echo 'https://example.enterprises'
2. URL does not linked.