updated README

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 </ul>
 <h2 id="sec:documentation-license" class="unnumbered unnumbered">License applicable to the documentation</h2>
 <p>Copyright ⓒ 2016–2020 Robert Alessi</p>
-<p>The documentation file <code>arabluatex.pdf</code> that is generated from the <code>arabluatex.dtx</code> source is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License. To view a copy of this license, visit <a href="http://creativecommons.org/licenses/by-sa/4.0/" class="uri">http://creativecommons.org/licenses/by-sa/4.0/</a> or send a letter to Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.</p>
+<p>Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled “GNU Free Documentation License” of the documentation.</p>
 <h1 id="sec:installation" class="unnumbered unnumbered">Installation</h1>
 <ol>
 <li><p>Run <code>'lualatex arabluatex.ins'</code> to produce the <code>arabluatex.sty</code> file;</p></li>