Update README

Author: derickr

README.md

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+wiki.php.net
+============
+
+Upgrades
+--------
+
+ - Make a backup: ``cd /srv && tar cvzf wiki-`date +"%Y-%m-%d"`.tar.gz``
+ - Follow https://www.dokuwiki.org/install:upgrade
+ - Instead of unpacking on the server, unpack in your local Git directory
+ - Restore ``register.txt`` via ``git restore -- dokuwiki/inc/lang/en/register.txt``
+ - Restore ``resetpwd.txt`` via ``git restore -- dokuwiki/inc/lang/en/resetpwd.txt``
+ - Review the changes (not every detail in larger upgrades of course)
+ - Commit and push
+ - Pull on the server (``cd /srv/web-wiki && sudo -u kelunik git pull``)