Update version [v5.4.0]

Author: hossein-zare

README.md

@@ -1,4 +1,4 @@
-# React Native Dropdown Picker 5.x [![Verified on Openbase](https://badges.openbase.com/js/verified/react-native-dropdown-picker.svg?token=Z1kyT9XFZj/yUB3urbRXWJEt/4f2e3yjjbPIlhhotNo=)](https://openbase.com/js/react-native-dropdown-picker?utm_source=embedded&utm_medium=badge&utm_campaign=rate-badge)
+# React Native Dropdown Picker 5.x
 
 <p float="left">
     <img src="https://user-images.githubusercontent.com/56504893/116790110-e0b36880-aac7-11eb-9ebd-196acee64f7a.png" width="270" alt="Screenshot">

package.json

@@ -1,6 +1,6 @@
 {
   "name": "react-native-dropdown-picker",
-  "version": "5.4.0-beta.0",
+  "version": "5.4.0",
   "description": "A single / multiple, categorizable, customizable, localizable and searchable item picker (drop-down) component for react native which supports both Android & iOS.",
   "keywords": [
     "picker",