add changelog

[ci skip]

CHANGES

@@ -42,6 +42,10 @@ Major release, unreleased
   (`#2282`_)
 - Auto-detect zero-argument app factory called ``create_app`` or ``make_app``
   from ``FLASK_APP``. (`#2297`_)
+- Factory functions are not required to take a ``script_info`` parameter to
+  work with the ``flask`` command. If they take a single parameter or a
+  parameter named ``script_info``, the ``ScriptInfo`` object will be passed.
+  (`#2319`_)
 
 .. _#1489: https://github.com/pallets/flask/pull/1489
 .. _#1898: https://github.com/pallets/flask/pull/1898
@@ -53,6 +57,7 @@ Major release, unreleased
 .. _#2259: https://github.com/pallets/flask/pull/2259
 .. _#2282: https://github.com/pallets/flask/pull/2282
 .. _#2297: https://github.com/pallets/flask/pull/2297
+.. _#2319: https://github.com/pallets/flask/pull/2319
 
 Version 0.12.2
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