No support for lookup types

**What version of TypeScript are you using?**
v3.1.6

**What version of `typescript-eslint-parser` are you using?**
v21.0.1

**What code were you trying to parse?**

```ts
type Hello = {
  hi: string,
}

type Foo = {
  bar: Hello['hi'],
}
```

**What did you expect to happen?**
No errors

**What happened?**
```
SyntaxError: Unexpected token, expected "]"
```

