Change license to CC-BY

Author: adam3smith

_includes/footer.html

@@ -22,4 +22,4 @@
   </ul>
 </div>
 
-<div class="page__footer-copyright">The contents of this page, unless otherwise specified, are licensed under the <a href="https://creativecommons.org/licenses/by-sa/4.0/" rel="nofollow">Creative Commons Attribution-ShareAlike 4.0 International License</a>. Hosted on <a href="https://github.com/citation-style-language/citation-style-language.github.io">GitHub Pages</a>, powered by <a href="http://jekyllrb.com" rel="nofollow">Jekyll</a> &amp; <a href="https://mademistakes.com/work/minimal-mistakes-jekyll-theme/" rel="nofollow">Minimal Mistakes</a>.</div>
+<div class="page__footer-copyright">The contents of this page, unless otherwise specified, are licensed under the <a href="https://creativecommons.org/licenses/by/4.0/" rel="nofollow">Creative Commons Attribution 4.0 International License</a>. Hosted on <a href="https://github.com/citation-style-language/citation-style-language.github.io">GitHub Pages</a>, powered by <a href="http://jekyllrb.com" rel="nofollow">Jekyll</a> &amp; <a href="https://mademistakes.com/work/minimal-mistakes-jekyll-theme/" rel="nofollow">Minimal Mistakes</a>.</div>