Changed MyBB 1.6.10 release year from 2012 to 2013.

MyBB 1.6.10 release year was incorrectly displayed as 2012. Changed it to 2013 to avoid confusion.
Merge pull request #12 from frantic-geek/gh-pages

Changed MyBB 1.6.10 release year from 2012 to 2013 to avoid confusion.