message: remove unused vars from builder-cache file
diff: -import chalk from 'chalk';
  import execa from 'execa';
  import semver from 'semver';
  import pipe from 'promisepipe';
  @@ -8,7 +7,6 @@ import { extract } from 'tar-fs';
  import { createHash } from 'crypto';
  import { createGunzip } from 'zlib';
  import { join, resolve } from 'path';
  -import { funCacheDir } from '@zeit/fun';
  import { PackageJson } from '@now/build-utils';
  import XDGAppPaths from 'xdg-app-paths';
  import {
  @@ -17,7 +15,6 @@ import {
  readFile,
  readJSON,
  writeFile,
  - remove,
  } from 'fs-extra';
  import pkg from '../../../package.json';
  @@ -104,11 +101,7 @@ export async function prepareBuilderDir() {
  if (!hasBundledBuilders(dependencies)) {
  const extractor = extract(builderDir);
  - await pipe(
  - createReadStream(bundledTarballPath),
  - createGunzip(),
  - extractor
  - );
  + await pipe(createReadStream(bundledTarballPath), createGunzip(), extractor);
  }
  return builderDir;
  