doc: update README to point to issues for questions (#264)

Author: eliben

README.md

@@ -52,7 +52,7 @@ reports and fixes.
 
 ## Community
 
-You can contact us on the [go-cloud mailing list][].
+For questions, please open [an issue](https://github.com/google/wire/issues).
 
 This project is covered by the Go [Code of Conduct][].