Update footer.html

Author: daattali

_includes/footer.html

@@ -31,8 +31,8 @@
       </p>
       <!-- Please don't remove this, keep my open source work credited :) -->
       {% unless site.remove-ads %}<p class="theme-by text-muted">
-        Theme by
-        <a href="https://beautifuljekyll.com">beautiful-jekyll</a>
+        Powered by
+        <a href="https://beautifuljekyll.com">Beautiful Jekyll</a>
       </p>{% endunless %}
       </div>
     </div>