Using pointers with Enum types results in nils

[threadwaste]

This is an extension of the issue highlighted by #114, and subsequently unintentionally fixed in #199. Specifically, the use of a pointer in a response type results in no resolution when e.g. serializing an Enum type.

Example, an Enum type of:

var enum = graphql.NewEnum(graphql.EnumConfig{
    Name: "MyEnum",
    Values: graphql.EnumValueConfigMap{
        "first-enum": &graphql.EnumValueConfig{Value: 1}
    }
}

...used with a response struct as follows:

type Response struct {
    MyEnum *int
}

[theRemix]

so does #220 and #206 close this issue?