Pass host without userinfo to domain_filter in check_url

[santhreal]

check_url passed the full netloc (including userinfo) to domain_filter, so valid URLs like http://user@t.co/ were rejected even though is_valid_url accepted them.

Strip userinfo before the domain check.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.77%. Comparing base (6f0f507) to head (1deff11).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #146   +/-   ##
=======================================
  Coverage   99.77%   99.77%           
=======================================
  Files          14       14           
  Lines         905      906    +1     
  Branches      173      173           
=======================================
+ Hits          903      904    +1     
  Misses          2        2           

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