chore: fix bootstrap on windows

[wardpeet]

I had to do 2 fixes to make yarn bootstrap work

1. Git should have files saved as LF so os.EOL doesn't work. Switching to just "\n" works.
2. cp does not exists on windows, cpy-cli can fix this. (happy to use any other package)

[ghost]

All CLA requirements met.

[orta]

Cool! I wonder what's up with the yarn install - re-running

[wardpeet]

@orta, I see that I committed a change with my prettier config. Should I revert? Are you ok with adding husky, prettier perhaps?

I'm happy to do the work

[orta]

Yeah, it's fine - that's the right prettier config, I think sometimes my editor gets confused and ships the default

[orta]

( I already have that stuff set up, but it only triggers for me )

[orta]

There we go, working fine - it was mainly just me pushing to master during work on #130 (comment)