Under Py3k, 'binary' is an alias for 'bytes'.

Also, update changelog to show changes merged from the 'py2_explicit_bytes'
branch.

CHANGES.rst

@@ -4,6 +4,14 @@ CHANGES
 0.4 (unreleased)
 ----------------
 
+- Added a fork of the Python 2.7 ``_pickle.c``, for use under Python2.
+  The fork adds support for the Py3k ``protocol 3`` opcodes.
+
+- Added a custom ``binary`` type for use in Python2 apps.
+  Derived from ``bytes``, the ``binary`` type allows Python2 apps to pickle
+  binary data using opcodes which will cause it to be unpickled as ``bytes``
+  on Py3k.  Under Py3k, the ``binary`` type is just an alias for ``bytes``.
+
 0.3 (2013-03-18)
 ----------------
 

src/zodbpickle/__init__.py

@@ -1,8 +1,11 @@
-# Make a package.
+import sys
 
-class binary(bytes):
-    """Mark a given string as explicitly binary
+if sys.version_info[0] < 3:
+    class binary(bytes):
+        """Mark a given string as explicitly binary
 
-    I.e., it should be unpickled as bytes on Py3k, rather than being
-          forcibly promoted to unicode.
-    """
+        I.e., it should be unpickled as bytes on Py3k, rather than being
+            forcibly promoted to unicode.
+        """
+else:
+    binary = bytes