(docs) Clarity

README.md

@@ -1,6 +1,6 @@
 # dns-rewrite-proxy [![CircleCI](https://circleci.com/gh/uktrade/dns-rewrite-proxy.svg?style=svg)](https://circleci.com/gh/uktrade/dns-rewrite-proxy) [![Test Coverage](https://api.codeclimate.com/v1/badges/33dcaf0af24e5a1a5bdf/test_coverage)](https://codeclimate.com/github/uktrade/dns-rewrite-proxy/test_coverage)
 
-A DNS proxy server that conditionally rewrites and filters A record requests
+A DNS proxy server that conditionally rewrites and filters A record requests. Written in Python, all code is in a single module, and there is a single dependency, [aiodnsresolver](https://github.com/michalc/aiodnsresolver).
 
 
 ## Usage