Prepare the 1.6.4 release. (pex-tool#691)

Fixes pex-tool#681

CHANGES.rst

@@ -1,9 +1,31 @@
 Release Notes
 =============
 
+1.6.4
+-----
+
+This release un-breaks `lambdex <https://github.com/wickman/lambdex>`_.
+
+* Restore ``pex.pex_bootstrapper.is_compressed`` API. (#685)
+  `PR #685 <https://github.com/pantsbuild/pex/pull/685>`_
+
+* Add the version of pex used to build a pex to build_properties. (#687)
+  `PR #687 <https://github.com/pantsbuild/pex/pull/687>`_
+
+* Honor interpreter constraints even when PEX_PYTHON and PEX_PYTHON_PATH not set (#668)
+  `PR #668 <https://github.com/pantsbuild/pex/pull/668>`_
+
 1.6.3
 -----
 
+This release changes the behavior of the ``--interpreter-constraint`` option.
+Previously, interpreter constraints were ANDed, which made it impossible to
+express constraints like '>=2.7,<3' OR '>=3.6,<4'; ie: either python 2.7 or
+else any python 3 release at or above 3.6. Now interpreter constraints are
+ORed, which is likely a breaking change if you have scripts that pass multiple
+interpreter constraints. To transition, use the native ``,`` AND operator in
+your constraint expression, as used in the example above.
+
 * Provide control over pex warning behavior. (#680)
   `PR #680 <https://github.com/pantsbuild/pex/pull/680>`_
 

pex/version.py

@@ -1,4 +1,4 @@
 # Copyright 2015 Pants project contributors (see CONTRIBUTORS.md).
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
-__version__ = '1.6.3'
+__version__ = '1.6.4'