v0.3.2

• FlashProvider class replaced by the FlashProviderInterface interface in FlashMiddleware and FlashTwigExtension.

v0.3.1

• Remove twig function: flash_clear_all
• Update README

v0.3.0

• Add flash provider interface
• Update classes to implement the interface
• Update tests

v0.2.2

• Starts the session if it does not exist when the getInstance function is called.

v0.2.1

• Update composer.json

v0.2.0

• Inclusion of the singleton class
• Full unit test coverage
• Some other refactorings