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Upgrade
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__copyright__ = 'this file is in the public domain'

if you have the bot installed via mercurial or subversion run the 
!upgrade command.

to upgrade from a tar file:

1) stop the bot
2) mv the old gozerbot dir
3) untar the tar file
4) copy (cp -R) the gozerdata, logs and myplugs dirs
5) start the bot
