Garden changelog.

CHANGES.rst

@@ -11,12 +11,10 @@
 - When testing ``PURE_PYTHON`` environments under ``tox``, avoid poisoning
   the user's global wheel cache.
 
-- Drop support for Python 2.6 and 3.2.
-
-- The pure-Python implementation, used on PyPy and when a C compiler
-  isn't available for CPython, now pickles identically to the C
+- Ensure that he pure-Python implementation, used on PyPy and when a C
+  compiler isn't available for CPython, pickles identically to the C
   version. Unpickling will choose the best available implementation.
-  This prevents interoperability problems and database corruption if
+  This change prevents interoperability problems and database corruption if
   both implementations are in use. While it is no longer possible to
   pickle a Python implementation and have it unpickle to the Python
   implementation if the C implementation is available, existing Python
@@ -24,8 +22,10 @@
   pickled again). See:
   https://github.com/zopefoundation/BTrees/issues/19
 
-- Unpickling empty BTrees in a pure-Python environment no longer
-  creates invalid objects that fail with ``AttributeError``.
+- Avoid creating invalid objects when unpickling empty BTrees in a pure-Python
+  environment.
+
+- Drop support for Python 2.6 and 3.2.
 
 4.2.0 (2015-11-13)
 ------------------