Update README.md

Author: RichardLindhout

README.md

@@ -132,13 +132,13 @@ You will need to add a polyfill for the Intl API on Android if:
 Install polyfills with Yarn
 
 ```
-yarn add react-native-localize @formatjs/intl-pluralrules @formatjs/intl-getcanonicallocales @formatjs/intl-listformat @formatjs/intl-displaynames @formatjs/intl-locale
+yarn add react-native-localize @formatjs/intl-pluralrules @formatjs/intl-getcanonicallocales @formatjs/intl-listformat @formatjs/intl-displaynames @formatjs/intl-locale @formatjs/intl-datetimeformat
 ```
 
 or npm
 
 ```
-npm install react-native-localize @formatjs/intl-pluralrules @formatjs/intl-getcanonicallocales @formatjs/intl-listformat @formatjs/intl-displaynames @formatjs/intl-locale --save
+npm install react-native-localize @formatjs/intl-pluralrules @formatjs/intl-getcanonicallocales @formatjs/intl-listformat @formatjs/intl-displaynames @formatjs/intl-locale @formatjs/intl-datetimeformat --save
 ```
 
 `./index.js`