Change version to a release candidate.

Author: GrahamDumpleton

src/wrapt/__init__.py

@@ -2,7 +2,7 @@
 Wrapt is a library for decorators, wrappers and monkey patching.
 """
 
-__version_info__ = ("2", "0", "1")
+__version_info__ = ("2", "0", "1", "rc1")
 __version__ = ".".join(__version_info__)
 
 from .__wrapt__ import (