Better prettier configuration

[znarf]

• add scripts to check the whole repository npm run prettier and npm run prettier-check
• apply with npm run prettier -- --write
• add .prettierignore
• add pre-commit hook using husky and lint-staged
• add check to CI to prevent formatting regressions

[codecov]

Codecov Report

Merging #490 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #490   +/-   ##
=======================================
  Coverage   98.18%   98.18%           
=======================================
  Files          40       40           
  Lines         771      771           
=======================================
  Hits          757      757           
  Misses         14       14

Impacted Files	Coverage Δ
src/cli.js	100% <0%> (ø)	⬆️

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[rumpl]

Hey @znarf thank you for this, could we just remove the husky integration? I really am not a fan of pre-commit checks that take time, I want my git to be fast, checking this on the CI is ok, but not on my machine. We can add it later if we see that too many contributions from external people are failing because of the prettier check.

Cheers

[rumpl]

Could you add the prettier check also to the appveyor and travis files?

We need less systems for our CI...

[znarf]

@rumpl I personally have good experience with pre-commit hooks for prettier. I understand your concerns and will remove it.

Haven't noticed appveyor and travis yet, will look at it.

[rumpl]

Thanks!