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kotlinlang

```
@ConfigurationProperties("foo")
class FooProperties {
	lateinit var foo1: String
	lateinit var foo2: String
	lateinit val bar = Bar()

	class Bar {
		lateinit var bar1: String
		lateinit var bar2: String
	}
}
```

Hi, Sébastien, I've been using `@ConfigurationProperties` in this manner for a while in a couple of my projects and didn't have problems. Looking forward to immutable data classes support, though :slightly_smiling_face:

Good news, yeah we will do that for 2.1 hopefully

I tend to use shorter `val bar = Bar()` instead of `lateinit val bar = Bar()` for those nested classes

`lateinit val` won't even work. only `var` can be `lateinit`. That's a mistype on Sébastien's part, I believe.