docs: Added missing deprecation note

docs/changelog.rst

@@ -13,6 +13,7 @@ Release 0.14 (in development)
 * Removed the ``RouteReset`` exception and associated logic.
 * ``bottle.HTTPError``\s raised on Invalid JSON now include the underlying exception
   in their ``exception`` field.
+* Removed the `bottle.py` console script entrypoint in favour of the new `bottle` script. You can still execute `bottle.py` directly or via `python -m bottle`. The only change is that the command installed by pip or similar tools into the bin/Scripts folder of the (virtual) environment is now called `bottle` to avoid circular import errors.
 
 Release 0.13
 ==============