Bump version to 6.9

* depsolv problem with modernizr

metadata.rb

@@ -4,7 +4,7 @@
 description      'Installs/Configures gitlab'
 long_description IO.read(File.join(File.dirname(__FILE__), 'README.md'))
 name             'gitlab'
-version          '6.4.6'
+version          '6.9.0'
 
 %w[build-essential zlib readline ncurses git openssh redisio xml
    ruby_build certificate database logrotate mysql nginx