Bump to version 4.0.2

Merge pull request prettier#1364 from prettier/401

Bump to version 4.0.1

Bump to v4.0.0

Bump to v3.2.2

Bump to v3.2.1

Bump version to 3.2.0

Bump to v3.1.2

Merge pull request prettier#1225 from prettier/rubocop

Update rubocop config

Bump to v3.1.0

Document necessary Ruby dependencies