chore(deps): update dependency prettier to v1.8.0 (#1113)

lib/config/decrypt.js

lib/config/validation.js

lib/manager/docker/registry.js

lib/manager/docker/update.js

lib/manager/npm/package.js

lib/platform/github/index.js

lib/platform/gitlab/index.js

lib/workers/branch/index.js

lib/workers/branch/schedule.js

lib/workers/package/versions.js

lib/workers/pr/index.js

lib/workers/repository/init/base.js

lib/workers/repository/onboarding/pr/base-branch.js

lib/workers/repository/onboarding/pr/pr-list.js

lib/workers/repository/updates/generate.js

package.json

yarn.lock