Merge pull request sidekiq#1222 from jonhyman/feature/fix-changelog

Update changelog link to Testing section of wiki.

Changes.md

@@ -7,7 +7,7 @@
   appear to be doing any work. [#1194]
 - Sidekiq's testing behavior is now dynamic.  You can choose between
   `inline` and `fake` behavior in your tests. See
-[Testing](wiki/Testing) for detail. [#1193]
+[Testing](https://github.com/mperham/sidekiq/wiki/Testing) for detail. [#1193]
 - The Retries table has a new column for the error message.
 - The Web UI topbar now contains the status and live poll button.
 - Orphaned worker records are now auto-vacuumed when you vist the