Update README to mention subscript access on collections.

mattpolzin · Jan 13, 2019 · 77f45b8 · 77f45b8
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diff --git a/README.md b/README.md
@@ -28,6 +28,13 @@ let animals: [Poly3<Dog, Cat, Rat>] = [
 ]
 ```
 
+To access all animals of a certain type, you can use subscripting like:
+```swift
+let dogs = animals[Dog.self]
+let cats = animals[Cat.self]
+let rats = animals[Rat.self]
+```
+
 You can get the `Dog`, `Cat`, or `Rat` value back out again, but you won't get any guarantees of which Type is being stored in a given `Poly`:
 ```swift
 let animal = Poly3<Dog, Cat, Rat>(Dog())