Updated CHANGELOG

- Set date for 2.8.0
- Removed empty 2.7.1 stub

Author: weierophinney

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 All notable changes to this project will be documented in this file, in reverse chronological order by release.
 
-## 2.8.0 - TBD
+## 2.8.0 - 2016-06-21
 
 ### Added
 
@@ -34,24 +34,6 @@ All notable changes to this project will be documented in this file, in reverse
 
 - Nothing.
 
-## 2.7.1 - TBD
-
-### Added
-
-- Nothing.
-
-### Deprecated
-
-- Nothing.
-
-### Removed
-
-- Nothing.
-
-### Fixed
-
-- Nothing.
-
 ## 2.7.0 - 2016-05-12
 
 ### Added