* Restored Python 2.5 compatibility (lost in 2.0).
2.1
===
Add persistent scheme and version tags for file based backends. Prepare for associated data handling in file based schemes.
2.0.3
=====
* Issue 112: Backend viability/priority checks now are more aggressive about module presence checking, requesting ``__name__`` from imported modules to force the demand importer to actually attempt the import.
2.0.2
=====
* Issue 111: Windows backend isn't viable on non-Windows platforms.
2.0.1
=====
* Issue 110: Fix issues with ``Windows.RegistryKeyring``.
2.0
===
12: Drop kwallet support, now superseded by the dual kwallet support in keyring.