reserved scala words within properties leads to compile errors

i was testing out this plugin and had a case where a field was defined as `type` which lead to a compile time error.

I'm open to some potential workarounds or a possible fix by wrapping fieldNames with backticks

```
Example:
description: example
properties:
type:
type: string
```

which could generate as the following

```
case class(`type`: String)
```