Fix rubocop issue, re-enable cop
Fix rubocop issue, re-enable cop

```
colorls.gemspec:26:1: W: Lint/MissingCopEnableDirective: Re-enable Metrics/BlockLength cop with # rubocop:enable after disabling it
# rubocop:disable Metrics/BlockLength
^
```

athityakumar/colorls,athityakumar/colorls