chore(tooling): Upgrade Prettier to 1.18.2

[lucivpav]

This PR upgrades Prettier to version 1.18.2

[lucivpav]

Does this change need a CHANGELOG.md entry? If so, in which category should I put it?

[DustyTheBot]

	Warnings
⚠️	There are no updates provided to CHANGELOG. Ensure there are no publicly visible changes introduced by this PR.

Generated by 🚫 dangerJS

[codecov]

Codecov Report

Merging #1744 into master will decrease coverage by 0.01%.
The diff coverage is 82.6%.

@@            Coverage Diff             @@
##           master    #1744      +/-   ##
==========================================
- Coverage   71.06%   71.05%   -0.02%     
==========================================
  Files         862      862              
  Lines        7172     7169       -3     
  Branches     2082     2082              
==========================================
- Hits         5097     5094       -3     
  Misses       2069     2069              
  Partials        6        6

Impacted Files	Coverage Δ
packages/react/src/lib/providerMissingHandler.ts	40% <ø> (ø)	⬆️
packages/react/src/components/Flex/FlexItem.tsx	78.57% <ø> (ø)	⬆️
.../commonTests/implementsCollectionShorthandProp.tsx	100% <100%> (ø)	⬆️
packages/react/src/components/Menu/MenuItem.tsx	34.04% <100%> (ø)	⬆️
packages/react/src/lib/positioner/Popper.tsx	87.23% <80.95%> (-0.53%)	⬇️

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[miroslavstastny]

Does this change need a CHANGELOG.md entry? If so, in which category should I put it?

No consumer-facing change -> no changelog entry