Clarify the version that should be installed of RNGH

Author: brentvatne

website/versioned_docs/version-3.x/getting-started.md

@@ -28,9 +28,9 @@ yarn add react-navigation
 Next, install react-native-gesture-handler. If you’re using the [Expo managed workflow](https://docs.expo.io/versions/latest/introduction/managed-vs-bare/) then you don’t need to do anything here, it’s included in the SDK. Otherwise:
 
 ```bash
-yarn add react-native-gesture-handler
+yarn add react-native-gesture-handler@~1.0.14
 # or with npm
-# npm install --save react-native-gesture-handler
+# npm install --save react-native-gesture-handler@~1.0.14
 ```
 
 Link all native dependencies: