Fix invalid type hinting for Variable types

Fixing type hint allows Pycharm and other IDEs likely too to figure out in which context should it suggest methods from the type of Variable, or from the type in Variables descriptior

Fix building on readthedocs

Also this added toml and toml-types as devs dependencies.

Full Changelog: 4.0.1...4.0.2

Fix docs

Fixed missing docstrings for some functions and new toml loaders.
Fix security vulnerability from pygments package.

Full Changelog: 4.0.0...4.0.1

4.0 Release

Added toml file format support
Changed way of variables initialization and configs initialization so it is only required to supply config source once when instancing config

What's Changed

• Verson 4.0 pre-release by @Rud356 in #13

Full Changelog: 3.0.4...4.0.0

Change license field in setup.py

3.0.4

Update setup.py

MIT license and mypy fixes

Fixed problems with mypy missing py.typed file and new error in loader_specific_deserializer.py file that came after 1.0.0 release of mypy
Change license from GPL to MIT to allow more people use library
Fix docs miss type

This will be a last release before making new 4.0.0 release

Minor fixes and dependencies updates

3.0.2

Minor fix of bug when loading empty file - data parameter may be None…

Update dependencies

3.0.1

Change version to 3.0.1

Version 3.0

What's Changed

• Now module will be called config_framework when you import it into project
• Structure of whole project is different comparing to 2.0
• Usage of VariableKey to create key that will tell how to access nested values
  without worrying about what symbols to use, but requiring to explicitly write
  VariableKey whenever you want to go from this root key
• Improved usability by using descriptors and making more logical arguments order
• By default, config will not allow you
  assigning any values after __post_init__ was called
• Version 3.0 by @Rud356 in #10

Full Changelog: 2.2.4...3.0.0

Update email and dependencies

2.2.4

Update __init__.py