README: maintainership information

README.md

@@ -4,3 +4,11 @@
 functions. It is similar to syb-with-class, but has many improvements.
 
 [Hackage](http://hackage.haskell.org/package/traverse-with-class)
+
+Maintainers
+-----------
+
+[Roman Cheplyaka](https://github.com/feuerbach) is the primary maintainer.
+
+[Adam Bergmark](https://github.com/bergmark) is the backup maintainer. Please
+get in touch with him if the primary maintainer cannot be reached.