v0.4.0

• Fixed typo in batch_load_fn TypeError
• Removed None default value for key arg in DataLoader.load()
• Removed Python 3.6 as a supported target version

v0.3.0

• Adds typing
• Drops support for Python<3.6
• Adds support for overriding get_cache_key in subclasses
• Improves README.md and removes README.rst

v0.2.1

• Resolve deprecation warning for Python 3.9
• Fix print related typos in the README files