Update dependency prettier to v2.8.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
prettier (source)	2.6.2 -> 2.8.1

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (d09d3b1) to head (38ef4e9).
⚠️ Report is 73 commits behind head on master.

Additional details and impacted files

@@ Coverage Diff @@## master #234 +/- ##
=========================================
Coverage 100.00% 100.00% =========================================
Files 1 1 Lines 44 51 +7 Branches 4 9 +5 =========================================
+ Hits 44 51 +7 

Flag	Coverage Δ
unittests	100.00% <ø> (ø)

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[renovate]

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