docs: point to github repo instead of email contact (#25)

README.md

@@ -206,8 +206,7 @@ This package is in beta. Its internals and interfaces are not stable
 and subject to change without a major semver bump;
 please reach out if you rely on any undocumented behavior.
 
-We are keen for your feedback; please email us at [founders@tryfinch.com](mailto:founders@tryfinch.com)
-or open an issue with questions, bugs, or suggestions.
+We are keen for your feedback; please open an [issue](https://www.github.com/Finch-API/finch-api-node/issues) with questions, bugs, or suggestions.
 
 ## Requirements