avoid Relaxed from matching trailing TLDs without a word break

[daviddyang9527]

When leveraging rxRelaxed.FindAllString to find all urls in SMS text, we found out that when sentences were connected without a blank after a dot it might mislead the regex and be detected as a legitimate url.
For example: a SMS text like

ups has informed us that your equipment has been delivered.The ups tracking number is 1zraxxxxxxx to track the status of your delivery click here hxxps://abc.com/yz3e4a2p|70994

Reproduction steps

        var test string = "ups has informed us that your equipment has been delivered.The ups tracking number is 1zraxxxxxxx to 
        track the status of your delivery click here hxxps://abc.com/yz3e4a2p|70994"
	rxRelaxed := xurls.Relaxed()
	fmt.Println(rxRelaxed.FindAllString(test, -1))  // [delivered.th https://abc.com/yz3e4a2p]

       	rxStrict := xurls.Strict()
	fmt.Println(rxStrict.FindAllString(test, -1)) // [https://abc.com/yz3e4a2p]

What did you expect to happen?
Relax method works as strict method, only one result comes out

What actually happened?
[delivered.th https://abc.com/yz3e4a2p] for relax method
[hxxps://abc.com/yz3e4a2p] for strict method

Environment

• xurls: v2.2.0
• golang: 1.16.4
• os: macos

[mvdan]

Indeed, this is a known problem, and I attempted to fix it a few months ago but didn't actually finish it. I'll take another look.

[mvdan]

Should be fixed in master now.