Changelog updates for next release

Changes.md

@@ -1,3 +1,13 @@
+Upcoming
+-----------
+
+- Provides ability to hook onto failure after max retries failed. [jkassemi, #780]
+- Delay on retry moved from constant proc to method call [lulalala, #784]
+- DSM V compatible symptom definition of developer frustration [colszowka, #782]
+- Fix bug in pagination link to last page [pitr, #774]
+- Upstart scripts for multiple Sidekiq instances [dariocravero, #763]
+- Use select via pipes instead of poll to catch signals [mrnugget, #761]
+
 2.8.0
 -----------