Update used-by.md

Add myfxhelper

versioned_docs/version-5.x/used-by.md

@@ -48,7 +48,7 @@ It's impossible to list every single app that uses React Navigation, but below a
 - [Disprz](https://www.disprz.com/) ([iOS](https://apps.apple.com/us/app/disprz/id1458716803#?platform=iphone)) ([Android](https://play.google.com/store/apps/details?id=com.disprz&hl=en_IN&gl=US))
 - [JustCash](https://justcash.app/) ([Android](https://play.google.com/store/apps/details?id=com.justcash&hl=en&gl=US))
 - [ActiveCollab](https://activecollab.com/) ([iOS](https://apps.apple.com/us/app/activecollab-work-management/id1509421965)) ([Android](https://play.google.com/store/apps/details?id=com.activecollab.mobile))
-
+- [Myfxhelper](https://www.myfxhelper.com/) ([iOS](https://apps.apple.com/id/app/myfxhelper-forex-signal/id1490556445)) ([Android](https://play.google.com/store/apps/details?id=com.mhfcorp.myfxhelper&hl=en&gl=US))
 ## Your app?
 
 If you would like to suggest to add your app to this list, [please open a pull request](https://github.com/react-navigation/website)!