fix: Allow Absolute Paths (#679)
fix: Allow Absolute Paths (#679)

Currently PurgeCSS only allows relative config path.
For example,
```shell
purgecss --config  abc/purgecss.config.js
```

This will allow absolute paths such as 
```shell
purgecss --config /Users/subash/Desktop/Test/purgecss.config.js
```
FullHuman/purgecss,FullHuman/purgecss,FullHuman/purgecss,FullHuman/purgecss