Installing environment for prettier cause error.

[damianbrzoza]

Hi Piotrek!

There are some troubles caused by changes in prettier repository.

Possible solution:
prettier/prettier#9459

You should change these lines in .pre-commit-config.yaml:

  - repo: https://github.com/prettier/prettier
    rev: 2.0.5

To something like this:

  -  repo: https://github.com/prettier/pre-commit
     rev: v2.1.2

[piotlinski]

Oh yes, they have recently changed that. I created a PR to fix this problem