Add Apphud to list of SwiftyStoreKit alternatives

README.md

@@ -47,6 +47,12 @@ Or if you're just getting started, consider skipping SwiftyStoreKit altogether a
 
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+### Apphud
+
+[Apphud](https://apphud.com/) is more than just making a purchase and validating receipts. Apphud is all-in-one infrastructure for your app growth. [Sign up for free](https://app.apphud.com/sign_up) and try it out.
+
+Or you can learn [how to migrate your app from SwiftyStoreKit to Apphud](https://docs.apphud.com/getting-started/migrate-from-swiftystorekit).
+
 ## Contributions Wanted
 SwiftyStoreKit makes it easy for an incredible number of developers to seemlessly integrate in-App Purchases. This project, however, is now **community-led**. We need help building out features and writing tests (see [issue #550](https://github.com/bizz84/SwiftyStoreKit/issues/550)).