Add a .dummy file in the changes directory to stop git from removing it

changes/.dummy

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+This file is here to keep git from removing the changes directory when
+all the changes files have been merged.
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+"I'm Nobody! Who are you?
+ Are you--Nobody--too?
+ Then there's a pair of us!
+ Don’t tell! they'd advertise--you know!
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+ How dreary--to be--Somebody!
+ How public--like a Frog--
+ To tell one's name--the livelong June--
+ To an admiring Bog!"
+    -- Emily Dickinson
+