Use HTTPS for link to KDE homepage

extension/options.html

@@ -119,7 +119,7 @@
         <span data-i18n="options_about_license, https://www.gnu.org/licenses/gpl-3.0.de.html" data-i18n-html="true">I18N</span><br>
         <span id="translators-aboutdata">I18N</span>
     </p>
-    <p data-i18n="options_about_created_by_kde, http://www.kde.org, https://community.kde.org/Plasma/Browser_Integration" data-i18n-html="true">I18N</p>
+    <p data-i18n="options_about_created_by_kde, https://www.kde.org, https://community.kde.org/Plasma/Browser_Integration" data-i18n-html="true">I18N</p>
     <p data-i18n="options_about_bugs, https://bugs.kde.org/buglist.cgi?product=plasma-browser-integration&resolution=---, https://bugs.kde.org/enter_bug.cgi?product=plasma-browser-integration" data-i18n-html="true">I18N</p>
 
     <img class="konqi" src="icons/aboutkde.svg">