Autolinks do not work

[thatch]

Description

The "autolink" method is no longer used, and it appears that they go through the regular "link" codepath just with no title. Mistune also uses "children" instead of "text" but because it's positional, this doesn't matter?

Noticed on https://github.com/facebookexperimental/usort/runs/5416284967?check_suite_focus=true

Exception occurred:
  File "C:\hostedtoolcache\windows\Python\3.7.9\x64\lib\site-packages\mistune\inline_parser.py", line [20](https://github.com/facebookexperimental/usort/runs/5416284967?check_suite_focus=true#step:7:20)7, in <genexpr>
    for t in self._scan(s, state, rules)
TypeError: link() missing 1 required positional argument: 'title'

PR incoming...

Details

• OS: Win/Mac/Lin
• Python version: 3.6-3.10
• Project version: 0.5.0 (and main)
• Can you repro on main? yes
• Can you repro in a clean virtualenv? yes