Tomoaki Abe ca58cbc09f Upgrade 'standard' (#709)
I have fixed the following error.

```
  node-fs-extra/lib/ensure/symlink-paths.js:37:9: Unnecessarily quoted property 'toCwd' found.
  node-fs-extra/lib/ensure/symlink-paths.js:38:9: Unnecessarily quoted property 'toDst' found.
  node-fs-extra/lib/ensure/symlink-paths.js:48:11: Unnecessarily quoted property 'toCwd' found.
  node-fs-extra/lib/ensure/symlink-paths.js:49:11: Unnecessarily quoted property 'toDst' found.
  node-fs-extra/lib/ensure/symlink-paths.js:58:13: Unnecessarily quoted property 'toCwd' found.
  node-fs-extra/lib/ensure/symlink-paths.js:59:13: Unnecessarily quoted property 'toDst' found.
  node-fs-extra/lib/ensure/symlink-paths.js:73:7: Unnecessarily quoted property 'toCwd' found.
  node-fs-extra/lib/ensure/symlink-paths.js:74:7: Unnecessarily quoted property 'toDst' found.
  node-fs-extra/lib/ensure/symlink-paths.js:82:9: Unnecessarily quoted property 'toCwd' found.
  node-fs-extra/lib/ensure/symlink-paths.js:83:9: Unnecessarily quoted property 'toDst' found.
  node-fs-extra/lib/ensure/symlink-paths.js:89:9: Unnecessarily quoted property 'toCwd' found.
  node-fs-extra/lib/ensure/symlink-paths.js:90:9: Unnecessarily quoted property 'toDst' found.
  node-fs-extra/lib/mkdirs/__tests__/clobber.test.js:22:18: There should be no space after '['.
  node-fs-extra/lib/mkdirs/__tests__/clobber.test.js:22:29: There should be no space before ']'.
  node-fs-extra/lib/mkdirs/__tests__/race.test.js:24:18: There should be no space after '['.
  node-fs-extra/lib/mkdirs/__tests__/race.test.js:24:29: There should be no space before ']'.
```
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