update changelog [ci skip]

d37ee297 · David Glick · 7d4ea692 · d37ee297
Commit d37ee297 authored Nov 27, 2016 by David Glick
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 - Make the CPython implementation consistent with the pure-Python
  implementation and only check object keys for default comparison
-  when setting keys. This makes it possible to remove keys that
-  were added using a less restrictive version of BTrees. See:
-  https://github.com/zopefoundation/BTrees/issues/53
+  when setting keys. In Python 2 this makes it possible to remove
+  keys that were added using a less restrictive version of BTrees.
+  (In Python 3 keys that are unorderable still cannot be removed.)
+  See: https://github.com/zopefoundation/BTrees/issues/53

 - Make the CPython implementation consistent with the pure-Python
  implementation and no longer raise ``TypeError`` for an object key