deprecate this repo (#113)

* deprecate this repo

* release v0.5.0

Author: marten-seemann

README.md

@@ -1,3 +1,7 @@
+# DEPRECATION NOTICE
+
+This package has moved into go-libp2p as a sub-package, github.com/libp2p/go-libp2p/p2p/security/noise.
+
 # go-libp2p-noise
 
 [![](https://img.shields.io/badge/made%20by-ETHBerlinZwei-blue.svg?style=flat-square)](https://ethberlinzwei.com)