update readme

Author: dwickern

README.md

@@ -73,17 +73,16 @@ println("sayHello")
 ```
 
 Without having an instance of the type for nested case classes:
-```scala
- import com.github.dwickern.macros.NameOf._
-
- case class Pet(age: Int)
- case class Person(name: String, pet : Pet)
-
- println(qualifiedNameOf[Person](_.pet.age))
+```scala mdoc:nest
+case class Pet(age: Int)
+case class Person(name: String, pet: Pet)
 
- // compiles to:
+println(qualifiedNameOf[Person](_.pet.age))
+```
+```scala mdoc:nest
+// compiles to:
 
- println("pet.age")
+println("pet.age")
 ```
 
 You can also use `nameOfType` to get the unqualified name of a type: