Update README.md

README.md

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             The Webis Group addresses challenges of the information society by conducting basic research, developing technology, and implementing and evaluating prototypes for future information systems. Our research contributes to web mining and retrieval, machine learning, computational linguistics, and symbolic AI.<br><br>
-            We are a tightly cooperating research network, formed by computer science chairs at the universities of <a href="http://halle.webis.de/">Halle</a>, <u><a href="http://leipzig.webis.de/">Leipzig</a></u>, <a href="http://paderborn.webis.de/">Paderborn</a>, and <a href="http://weimar.webis.de/" class="underline">Weimar</a>.
+            We are a tightly cooperating research network, formed by computer science chairs at the universities of <a href="http://halle.webis.de/" class="underline">Halle</a>, <a href="http://leipzig.webis.de/" class="underline">Leipzig</a>, <a href="http://paderborn.webis.de/" class="underline">Paderborn</a>, and <a href="http://weimar.webis.de/" class="underline">Weimar</a>.
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