correct link to the license file
I've noticed that when the "license|MIT" icon is pressed on README page, it returns 404 Error code. So I replaced the link with the one from the repository.
<a href="https://docs.pyinfra.com"><img alt="Docs status" src="https://img.shields.io/github/workflow/status/Fizzadar/pyinfra/Generate%20&amp;%20Deploy%20Docs/master?label=docs"></a>
<a href="https://github.com/Fizzadar/pyinfra/actions?query=workflow%3A%22Execute+tests%22"><img alt="Execute tests status" src="https://img.shields.io/github/workflow/status/Fizzadar/pyinfra/Execute%20tests/master?label=tests"></a>
<a href="https://codecov.io/github/Fizzadar/pyinfra"><img alt="Codecov Coverage" src="https://img.shields.io/codecov/c/gh/Fizzadar/pyinfra"></a>
- <a href="https://github.com/Fizzadar/pyinfra/blob/develop/LICENSE.md"><img alt="MIT Licensed" src="https://img.shields.io/pypi/l/pyinfra"></a>
+ <a href="https://github.com/Fizzadar/pyinfra/blob/2.x/LICENSE.md"><img alt="MIT Licensed" src="https://img.shields.io/pypi/l/pyinfra"></a>
</p>
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