Fix for a small line numbering error.

[vince2corte]

Small library very useful for me. Thank's a lot !

Line 129 of the file lib/Dif/Renderer/Html/SideBySide.php should be corrected like this:
$toLine = $change['base']['offset'] + $no + 1; -> $toLine = $change['changed']['offset'] + $no + 1;

My two cents..

[JBlond]

This project is dead, but you can use https://github.com/JBlond/php-diff