chore(deps): update dependency prettier to v1.19.1 (#5169)

lib/datasource/git-submodules/index.ts

lib/datasource/github/index.ts

lib/datasource/gitlab/index.ts

lib/datasource/go/index.ts

lib/datasource/orb/index.ts

lib/datasource/packagist/index.ts

lib/datasource/terraform-provider/index.ts

lib/datasource/terraform/index.ts

lib/manager/bazel/update.ts

lib/manager/composer/extract.ts

lib/manager/git-submodules/extract.ts

lib/manager/gomod/artifacts.ts

lib/manager/npm/extract/index.ts

lib/manager/npm/extract/npm.ts

lib/manager/travis/package.ts

lib/platform/azure/azure-helper.ts

lib/platform/bitbucket-server/index.ts

lib/platform/bitbucket/index.ts

lib/platform/git/storage.ts

lib/platform/github/index.ts