Merge pull request #428 from android/astamato-patch-2

Update README.md

EmojiCompat/README.md

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 Android EmojiCompat Sample (Kotlin)
 ===================================
 
+⚠️⚠️⚠️ *Caution*: the `androidx.emoji:emoji` library is deprecated in favor of `androidx.emoji2:emoji2`, which provides integration into `androidx.appcompat`.
+To support modern emoji and simplify backward-compatibility with lower versions of Android, it's recommended that you migrate to the `androidx.emoji2:emoji2` library. 
+For details on how to implement, see [Support modern emoji](https://developer.android.com/develop/ui/views/text-and-emoji/emoji2).
+
+------------
+
 This sample demonstrates usage of EmojiCompat support library. You can use this library
 to prevent your app from showing missing emoji characters in the form of tofu (□). You
 can use either bundled or downloadable emoji fonts. This sample shows both usages.