Prepare 2.8.0 release

Author: felixbuenemann

README.md

@@ -74,6 +74,8 @@ We no longer support Ruby 1.8 or versions of Rails/ActiveRecord older than 3.0.
 Moving forward we will do our best to support the latest versions of ActiveRecord and Ruby.
 
 ## Change Log
+* 2.8.0 - August 27, 2018
+	* Added support for rails 5.2, see #76, #77 -- felixbuenemann
 * 2.7.1 - January 30, 2018
 	* Fix column quoting if the `:order` option is a symbol, see #73, #74 -- felixbuenemann
 * 2.7.0 - September 15, 2017

lib/acts_as_tree/version.rb

@@ -1,3 +1,3 @@
 module ActsAsTree
-  VERSION = "2.7.1"
+  VERSION = "2.8.0"
 end