Prepare release 0.2.8

Author: stloyd

CHANGELOG.md

@@ -1,10 +1,11 @@
 Changelog
 =========
 
-## 0.2.8 (2013-xx-xx)
+## 0.2.8 (2013-09-19)
 * Fix: Added missing parts in user providers like: `loadUserByUsername()`
   or `refreshUser()` methods
 * Fix: Registering of user provider services
+* Fix: Make `OAuthUtils::signRequest()` compatible with OAuth1.0a specification
 
 ## 0.2.7 (2013-08-03)
 * Fix: Polish oauth error detection to cover cases from i.e. Facebook resource owner