Update to 2.26

Upstream changes:
2.26    Thu Dec 29 22:36:54 CST 2016
    Stable release.  No changes from previous release.

2.25_02 Tue Dec 27 14:34:22 CST 2016
    [FIXES]
    html_fragment_ok() was not properly excluding document-level errors.
    It was effectively the same as html_ok().

2.25_01 Fri Dec 23 22:36:17 CST 2016
    [ENHANCEMENTS]
    Added two new types of errors to let you know you're using the
    API incorrectly.  You should be parsing files like this:

        my $lint = HTML::Lint->new;
        $lint->newfile( $filename );
        $lint->parse( $line );
        $lint->eof();
        my @errors = $lint->errors();

    If you neglect to call ->parse or ->eof, you'll get an error returned
    in the list of errors from ->errors().

    [FIXES]
    Test::HTML::Lint::html_fragment_ok() was not properly calling ->eof.

(wen)