message: Update text to be more helpful
diff: -Removed `upgrade-db-0.*.js` scripts. Use an older release to upgrade NeDB.
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  +Removed `upgrade-db-0.*.js` scripts which were used to upgrade old versions of the NeDB database. If you are upgrading from <=0.9.1 then you can find the upgrade scripts [here](https://github.com/matrix-org/matrix-appservice-irc/tree/0.14.0/scripts).
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