Change package description (#3162)

This package ain't experimental for years, innit?

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Co-authored-by: Jakub Piasecki <jakub.piasecki@swmansion.com>

package.json

@@ -1,7 +1,7 @@
 {
   "name": "react-native-gesture-handler",
   "version": "2.20.0",
-  "description": "Experimental implementation of a new declarative API for gesture handling in react-native",
+  "description": "Declarative API exposing native platform touch and gesture system to React Native",
   "scripts": {
     "prepare": "bob build && husky install",
     "test": "jest",