Add entry in the known issues section for problems with Jest.

[janhesters]

As @kelset suggested in this issue, I created a pull request to the known issues section of changelog.md to mention the problems that currently exist with Jest.

[kelset]

jest.mock() is broken

I'm having an hard time understanding why you say that mock is broken, the issue you link seems to suggest that it's only a local babel missconfiguration and not mock being broken.

Is there another issue with a repro that show that clarifies that jest.mock is broken for all 0.57.x projects? If not, can you create one that shows how it's not depending on the babel configuration of a specific project?

[janhesters]

Okay, I'm sorry. You are right it seems to be some kind of misconfiguration. I created a new project and tried to reproduce the bug, but jest.mock() now works 🤷🏻‍♂️

Guess I'll have to migrate my old project into a freshly created one like that, because my .babelrc is the same verbatim in the freshly created project and the old one where jest.mock() does not work.