Added type hints to delegation pattern - #326
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Delegation pattern can be much easier to understand with type annotations. It doesn't affect the tests. Tested on python 3.6, 3,7 and 3.8. I also suggest adding type hints gradually to other examples too. This can make the intents of the code snippets much clearer.
Also fixed some minor formatting issues (Adding 2 empty lines after import, double quoting the strings everywhere etc.)