fix(deps): update dependency prettier to v2

[JustinBeckwith]

No description provided.

[Maxim-Mazurok]

It would be great to see this merged, I can't use

readonly #cwd: string;

with old prettier version for some reason.
Updating to 2.0.1 helps

[codecov-io]

Codecov Report

Merging #464 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #464   +/-   ##
=======================================
  Coverage   96.33%   96.33%           
=======================================
  Files           6        6           
  Lines        1118     1118           
  Branches      153      153           
=======================================
  Hits         1077     1077           
  Misses         41       41

Impacted Files	Coverage Δ
test/test-init.ts	100% <100%> (ø)	⬆️

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