Add versioning

Author: tolu360

README.md

@@ -22,6 +22,15 @@ You can pull in react-native-paystack via npm:
 ```shell
 npm install react-native-paystack --save
 ```
+OR 
+
+```shell
+yarn add react-native-paystack
+```
+
+### Versioning
+For `RN <=0.39` use version 2+ e.g. react-native-paystack@2.1.4
+For `RN >=0.40` use version 3+ e.g. react-native-paystack@3.0.4
 
 ### Configuration
 

package.json

@@ -3,7 +3,7 @@
   "description": "React Native Wrappers for Paystack Android & iOS Mobile SDKs",
   "main": "index.js",
   "author": "Tolu Olowu (Arttitude 360) <tolu@arttitude360.com>",
-  "version": "2.1.3",
+  "version": "2.1.4",
   "scripts": {
   },
   "repository": {