Exclude nested dir from top config

Firstly, release-please is incredibly useful. Thank you

**Is your feature request related to a problem? Please describe.**
I'm working on a monorepo and have many packages.
The monorepo also holds some configuration that needs to be excluded in my case (deploy folder)
These deploy folders exist under each packages:
- `packages/one/deploy`
- `packages/two/deploy`

**Describe the solution you'd like**
I would like to be able to use exclude-paths as is
```json
{
"exclude-paths": ["**/deploy"]
}
```

**Describe alternatives you've considered**
As of today, the alternative is to specify the `exclude-paths` under each package configuration