This change is made because the linkchecker handlers only process
Tags.
The test HtmlPrettyPrinter handler is updated to output element text
because its support for non-Tag elements has been removed. This results
in a number of the existing tests still passing.
Shown every time linkchecker is run:
/usr/lib/python3.7/site-packages/bs4/element.py:16: UserWarning: The
soupsieve package is not installed. CSS selectors cannot be used.
'The soupsieve package is not installed. CSS selectors cannot be used.'