Update README.md (#106)

Add information about expo support

Author: Naturalclar

README.md

@@ -6,6 +6,8 @@ React Native SegmentedControl library. Use SegmentedControl to render a UISegmen
 
 For Android and Web, it has a js implementation that mocks iOS 13 style of UISegmentedControl.
 
+**For Expo Users:** Expo SDK 38 or later is required for this package.
+
 | iOS                                                                                                                           | Android                                                                                                                       | Web                                                                                                                          |
 | ----------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------- |
 | <img src="https://user-images.githubusercontent.com/6936373/71608757-dc6ef680-2bc6-11ea-85be-aa31f25ecf36.png" width="320" /> | <img src="https://user-images.githubusercontent.com/6936373/79550655-9edd9d00-80d3-11ea-98bf-8b7c0b0798d3.png" width="320" /> | <img src="https://user-images.githubusercontent.com/6936373/79590620-3f52b200-8112-11ea-863b-236c4465fba6.png" width="640"/> |