Removed E_DEPRECATED error explicit nullable types #132
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This PR solves the E_DEPRECATED errors such as:
in file caxy/php-htmldiff/lib/Caxy/HtmlDiff/HtmlDiffConfig.php
See also https://www.php.net/manual/en/migration84.deprecated.php
After merging this PR, please make a new release as well, such that users of composer can update easily.