chore: set App Store badge in README

Author: MainasuK

README.md

@@ -1,5 +1,5 @@
 # Mastodon
-
+<a href="https://apps.apple.com/us/app/mastodon-for-iphone/id1571998974?itsct=apps_box_badge&amp;itscg=30200" style="display: inline-block; overflow: hidden; border-top-left-radius: 13px; border-top-right-radius: 13px; border-bottom-right-radius: 13px; border-bottom-left-radius: 13px; width: 250px; height: 83px;"><img src="https://tools.applemediaservices.com/api/badges/download-on-the-app-store/black/en-us?size=250x83&amp;releaseDate=1627603200&h=72b0c8495c2c0af1291efef280c4c2c1" alt="Download on the App Store" style="border-top-left-radius: 13px; border-top-right-radius: 13px; border-bottom-right-radius: 13px; border-bottom-left-radius: 13px; width: 250px; height: 83px;"></a>
 
 ## Requirements
 
@@ -72,7 +72,6 @@ The app is compatible with [toot-relay](https://github.com/DagAgren/toot-relay)
 - [SwiftGen](https://github.com/SwiftGen/SwiftGen)
 - [SwiftUI-Introspect](https://github.com/siteline/SwiftUI-Introspect)
 - [SwiftyJSON](https://github.com/SwiftyJSON/SwiftyJSON)
-- [SwiftyJSON](https://github.com/SwiftyJSON/SwiftyJSON)
 - [Tabman](https://github.com/uias/Tabman)
 - [Texture](https://github.com/TextureGroup/Texture)
 - [ThirdPartyMailer](https://github.com/vtourraine/ThirdPartyMailer)