Generated code does not compile if member name is "type"

[sscarduzio]

Type is a reserved word in Scala, if you try to generate a case class for something like: {"type": "a"} it will not compile.

Solution: generate case class code with back ticks, like: type

[pierre-borckmans]

Just pushed a PR for this

[guizmaii]

As said @pierre-borckmans, related to #6