chore(prettier): ignore package.json

[wKovacs64]

What:

Ignore package.json when formatting with prettier to avoid conflicting with the npm/yarn format.

Why:

npm and yarn both format package.json in a common, opinionated way. Formatting JSON files with prettier yields a different result. People using the popular editor.formatOnSave feature in VSCode with prettier integration (for example) will inadvertently reformat package.json and clutter up commits going back and forth between the two formats any time npm or yarn modifies package.json. Other forms of automated formatting will also reveal the problem (even npm run setup as documented in this project's contributing guide). It looks like package.json was most likely formatted with prettier in 1b1fd1b.

How:

• added package.json to .prettierignore
• reformatted package.json to prevent future diffs

Checklist:

• Documentation N/A
• Tests N/A
• Ready to be merged
• Added myself to contributors table

See also:
Stop re-formatting package.json with Prettier and VSCode once and for all by Martin Hochel

[codecov-io]

Codecov Report

Merging #255 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #255   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           4      4           
  Lines         296    296           
  Branches       71     71           
=====================================
  Hits          296    296

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[kentcdodds]

That's fine with me 👍 Thanks!