small fix in readme

Author: Peybro

README.md

@@ -1,9 +1,10 @@
 # WikiLinks - a Web Browser Extension
 
-Get it on Mozilla Add-Ons: <a href="https://addons.mozilla.org/de/firefox/addon/wikilinks/">https://addons.mozilla.org/de/firefox/addon/wikilinks/</a>
-</br>
 Adds an anchor link to every headline of a Wikipedia article for handy sharing without finding out the correct ID of the heading first.
 
+<hr>
+Get it on Mozilla Add-Ons: <a href="https://addons.mozilla.org/de/firefox/addon/wikilinks/">https://addons.mozilla.org/de/firefox/addon/wikilinks/</a>
+
 ## Example & Usage
 
 If you're reading this on GitHub right now hover with your mouse over 'Example & Usage' and see the small icon left to it appear.