update README

Author: joesavage

README.md

@@ -4,7 +4,7 @@
 
 HTTP GET requests from blacklisted referers are modified to requests with the filename 'phishing' and the file extension of the original request - this means requests via blacklisted referers go through a normal request pipeline (through any other reverse proxies, etc.), and that different types of replacement resources can be served up for different requested file extensions (including HTML files [e.g. for phishing sites that redirect to yours after stealing credentials], CSS files [e.g. change the styles of a phishing site that hotlinks stylesheets], image files [e.g. replace hotlinked images with warning images], etc.).
 
-This application isn't quite ready for a high traffic production environment quite yet - from my local testing it can handle a couple of hundred concurrent requests fairly reliably, but things may be different in different environments. Certainly before employing this in my own production environments I would optimise the codebase a little more (and probably add some form of multi-threading).
+**This application has not been tested with any real rigor, and so is not currently suitable for use in a production environment.** It also isn't quite ready for high traffic environments yet - from my local testing it can handle a couple of hundred concurrent requests fairly reliably, but things may be different in different environments. Adding multi-threading and optimising the code via the results of proper profiling are performance-related tasks I'm hoping to complete in future.
 
 This project makes use of the [libev](http://software.schmorp.de/pkg/libev.html) library for fast event-driven I/O.