ERROR in Path must be a string.

```
new CopyWebpackPlugin([
	{
		from: {
			glob: 'manifest.json'
		}
	}
]);
```


```
ERROR in Path must be a string. Received { glob: 'manifest.json' }
```

```
"webpack": "^1.13.2",
"copy-webpack-plugin": "^4.0.0"
```