docs: point to github repo instead of email contact (#4)

Author: stainless-bot

README.md

@@ -8,7 +8,7 @@
 
 The Lithic Java SDK provides convenient access to the Lithic REST API from applications written in Java. It includes helper classes with helpful types and documentation for every request and response property.
 
-This package is currently in beta (pre-v1.0.0). We expect some breaking changes to rarely-used areas of the SDK, and appreciate your [feedback](mailto:sdk-feedback@lithic.com).
+This package is currently in beta (pre-v1.0.0). We expect some breaking changes to rarely-used areas of the SDK, and appreciate your [feedback](https://www.github.com/lithic-com/lithic-java/issues).
 
 The Lithic Java SDK is similar to the Lithic Kotlin SDK but with minor differences that make it more ergonomic for use in Java, such as `Optional` instead of nullable values, `Stream` instead of `Sequence`, and `CompletableFuture` instead of suspend functions.