docs(CHANGES): Don't forget to mention doc/ -> docs/

Author: tony

CHANGES

@@ -10,6 +10,7 @@ current
 - :issue:`295`: Move more packaging over to poetry, though we'll keep
   setup.py for the moment to ensure compatibility package maintainers.
 - :issue:`295`: New development instructions
+- :issue:`295`: Move doc/ to docs/
 
 libtmux 0.8.3 (2020-08-16)
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