py-dogpile-cache: updated to 1.2.0

1.2.0

[feature] [region]
Added new construct api.CantDeserializeException which can be raised by user-defined deserializer functions which would be passed to CacheRegion.deserializer, to indicate a cache value that can窶冲 be deserialized and therefore should be regenerated. This can allow an application that窶冱 been updated to gracefully re-cache old items that were persisted from a previous version of the application. Pull request courtesy Simon Hewitt.

(adam)