Add extension creator to the credits page

Given that the credits page now includes many different contributors
(from translators to a list of open source projects used in the
extension), I thought it would be a good idea to add myself too.

Change-Id: Ie098d018e108af7ad2e48906ca75bcb9ec584198
diff --git a/src/options.html b/src/options.html
index 0d40a36..5ef8a20 100644
--- a/src/options.html
+++ b/src/options.html
@@ -48,13 +48,14 @@
   <dialog id="credits_dialog">
     <div class="scrollable">
       <h3 data-i18n="credits"></h3>
+      <div class="entry createdby">
+        <div data-i18n="credits_createdby"></div>
+      </div>
       <div class="entry">
         <a href="https://gtranslate.avm99963.com/" class="homepage" target="_blank" data-i18n="credits_homepage"></a>
         <h4 data-i18n="credits_translations"></h4>
-        <div data-i18n="credits_translations_paragraph">
-        </div>
-        <ul id="translators">
-        </ul>
+        <div data-i18n="credits_translations_paragraph"></div>
+        <ul id="translators"></ul>
       </div>
       <div class="content_area">
       </div>