v5.0.0

Handle multiple inheritance properly.
Support simple type annotations e.g. list[int] (but only use list)

Ooops - missed v4.

v3.0

Drops support for plain functions.
Deprecates module register function in favour of BaseClass.method.register()
Supports per-instance dispatch registries.

Version 2.0

• Added support for annotations as per python 3.7 functools.singledispatch to Python 3.6+
• Use __init_subclass__ instead of a meta class for Python 3.6+
• Allow using actual method instead of method name in register() function
• Fixed missing dispatch and registry attributes on method objects.