Update changelog.txt

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 ===RC6===
 *Started adding 3.1 recipes, if information is inaccurate/missing/etc please feel free to submit corrections via a ticket.
+*Database updates for many recipes
+*Fixed minor issues with the progress bar and excluded recipes
+*Added some basic tracking for alt professions, no gui/interface for this, but it's being tracked right now for future upgrades to ARL.
+*Expanded the classes filter to allow you to select classes individually.

 ===RC5===
 *Added donation info, please take a look, it's not just about money. :)