Add release note links to CHANGELOG

Author: igorw

CHANGELOG.md

@@ -3,6 +3,8 @@ CHANGELOG
 
 * 0.2.6 (2012-12-26)
 
+[Release notes](https://gist.github.com/4382382)
+
   * Feature: [Cache] New cache component, used by DNS
   * Bug fix: [Http] Emit end event when Response closes (@beaucollins)
   * Bug fix: [EventLoop] Plug memory issue in libevent timers (@cameronjacobson)
@@ -16,6 +18,8 @@ CHANGELOG
 
 * 0.2.4 (2012-11-18)
 
+[Release notes](https://gist.github.com/4108347)
+
   * Feature: [Stream] Added ThroughStream, CompositeStream, ReadableStream and WritableStream
   * Feature: [Stream] Added BufferedSink
   * Feature: [Dns] Change to promise-based API (@jsor)