One length subdomain doesn't recognized.

Hi! I am using your package and it is really good. 
I've faced a problem now, I have a subdomain with one length. I can't add to Linkable.

for example:
`https://a.mywebsite.com/directory` 
parsed as
`https://a.` `mywebsite.com/directory`
Only the second part is tappable. 

Could you fix the problem?

Thank you :)