v0.4.0

Remove the use of typingplus by importing the additional functions it…

v0.3.6

Fix pylint settings for py3.

v0.3.5

Update requirement on typingplus to 2.2.1 for upgrade_typing.

v0.3.4

Singleton now catches TypeError when handling updates.

v0.3.3

Fix pep8 spacing error.

v0.3.2

Add IdempotentSingleton.

v0.3.1

Add the metaclass decorator.

v0.3.0

Make attributes undefined but annotated Optional actually optional.

v0.2.1

Remove python 3.3 from Travis.

v0.2.0

Add isinstance tests for validation classes.