Merge pull request #369 from azu/azu-patch-1

fix(website): update ribbon

index.adoc

@@ -29,7 +29,7 @@ These translated is based on Promise Book ver 1.
 ifeval::["{backend}" == "html5"]
 ++++
 <div class="github-ribbon">
-<a href="https://github.com/azu/promises-book/"><img style="border: 0;" src="https://camo.githubusercontent.com/38ef81f8aca64bb9a64448d0d70f1308ef5341ab/68747470733a2f2f73332e616d617a6f6e6177732e636f6d2f6769746875622f726962626f6e732f666f726b6d655f72696768745f6461726b626c75655f3132313632312e706e67" alt="Fork me on GitHub" data-canonical-src="https://github.blog/wp-content/uploads/2008/12/forkme_right_darkblue_121621.png" /></a>
+<a href="https://github.com/azu/promises-book/"><img style="border: 0;" src="https://github.blog/wp-content/uploads/2008/12/forkme_right_darkblue_121621.png" alt="Fork me on GitHub" data-canonical-src="https://github.blog/wp-content/uploads/2008/12/forkme_right_darkblue_121621.png" /></a>
 </div>
 ++++