updated CHANGELOG.txt

git-svn-id: svn://svn.code.sf.net/p/processhacker/code@5362 21ef857c-d57f-4fe0-8362-d861dc6d29cd
updated for 2.31 release

git-svn-id: svn://svn.code.sf.net/p/processhacker/code@5363 21ef857c-d57f-4fe0-8362-d861dc6d29cd
updated footer date for 2013

git-svn-id: svn://svn.code.sf.net/p/processhacker/code@5364 21ef857c-d57f-4fe0-8362-d861dc6d29cd
* bump to 2.32
* enable AllowOnlyOneInstance by default

git-svn-id: svn://svn.code.sf.net/p/processhacker/code@5365 21ef857c-d57f-4fe0-8362-d861dc6d29cd