Patchwork is not a dev dependency

After installing from Composer using ``composer global require anahkiasen/rocketeer:~2.0``, ``rocketeer ignite`` failed. The error was 

```bash
Fatal error: Class 'Patchwork\Utf8' not found in /Users/hassankhan/.composer/vendor/illuminate/support/Illuminate/Support/Str.php on line 18
```