fix: upgrade prettier to v2

[tunnckoCore]

• upgrade prettier everywhere
• couple of changes in prettier v2

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Hey @tunnckoCore, check out this one too! ;)

[codecov]

Codecov Report

Merging #131 into master will not change coverage.
The diff coverage is 40%.

@@           Coverage Diff           @@
##           master     #131   +/-   ##
=======================================
  Coverage   55.72%   55.72%           
=======================================
  Files          39       39           
  Lines        1258     1258           
  Branches      366      365    -1     
=======================================
  Hits          701      701           
- Misses        443      444    +1     
+ Partials      114      113    -1

Impacted Files	Coverage Δ
@tunnckocore/utils/src/index.js	100% <ø> (ø)	⬆️
@packages/jest-runner-docs/src/docks.js	8.92% <0%> (ø)	⬆️
@packages/jest-runner-rollup/src/runner.js	10.06% <0%> (ø)	⬆️
@packages/glob-cache/src/index.js	100% <100%> (ø)	⬆️
@packages/prettier-plugin-pkgjson/src/index.js	44.44% <100%> (ø)	⬆️

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