Support for regexp "pattern"

Would it be possible to support regexp "pattern" in CRDs?

Here's an example snippet from a CRD

```yaml
rootUrl:
  description: Root URL 
  type: string
  format: uri
  pattern: "^https://[^/]+/?$"
```

On crdoc 0.6.4, the description, type and format are rendered in the resulting markdown table. If would be really useful if the RegExp pattern could also appear.

Thanks very much!