docs: update maintainers (#164)

CODEOWNERS

@@ -1 +1 @@
-* nugaon vojtechsimetka
+* @Cafe137 @vojtechsimetka

README.md

@@ -84,8 +84,10 @@ There are some ways you can make this module better:
 
 ## Maintainers
 
-- [nugaon](https://github.com/nugaon)
 - [vojtechsimetka](https://github.com/vojtechsimetka)
+- [Cafe137](https://github.com/Cafe137)
+
+See what "Maintainer" means [here](https://github.com/ethersphere/repo-maintainer).
 
 ## License