Make msgpack-python deprecated clone of msgpack.

Author: methane

README.rst

@@ -10,8 +10,8 @@ MessagePack for Python
    :target: https://msgpack-python.readthedocs.io/en/latest/?badge=latest
    :alt: Documentation Status
 
-Upgrading from msgpack-0.4
---------------------------
+IMPORTANT: Upgrading from msgpack-0.4
+--------------------------------------
 
 TL;DR: When upgrading from msgpack-0.4 or earlier, don't do `pip install -U msgpack-python`.
 Do `pip uninstall msgpack-python; pip install msgpack` instead.

dummy/README

@@ -9,6 +9,9 @@
 
 from distutils.command.build_ext import build_ext
 
+# for building transitional package.
+TRANSITIONAL = False
+
 class NoCython(Exception):
     pass
 
@@ -102,7 +105,13 @@ def __init__(self, *args, **kwargs):
     long_desc = f.read()
 del f
 
-setup(name='msgpack',
+name = 'msgpack'
+
+if TRANSITIONAL:
+    name = 'msgpack-python'
+    long_desc = "This package is deprecated.  Install msgpack instead."
+
+setup(name=name,
       author='INADA Naoki',
       author_email='[email protected]',
       version=version_str,