superTypeParameters is missing in the AST

**What version of TypeScript are you using?**

2.3.2

**What version of `typescript-eslint-parser` are you using?**

`master`.

**What code were you trying to parse?**

```ts
class X extends Y<A, B> {}
```

**What did you expect to happen?**

Parse successfully, assigning to `superTypeParameters` in the AST.

**What happened?**

`superTypeParameters` is missing in AST.

