Fixed TLD limitation

setup/templates/steps/config.html

@@ -70,7 +70,7 @@ Or in plain english: if receivers start to classify your mail as spam, this post
   <label>Linked Website URL</label>
 <!--   Validates url with or without https:// -->
   <input class="form-control" type="url" name="website" value="https://mailu.io" required
-  		pattern="^(https?://)?([a-zA-Z0-9]([a-zA-ZäöüÄÖÜ0-9\-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,6}$">
+		pattern="^(https?://)?([a-zA-Z0-9]([a-zA-ZäöüÄÖÜ0-9\-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,}$">
 </div>
 
 <p>The admin interface is the main Mailu-specific bit, it provides tools to