documentation issue in README.md

Created by: dale6john

The example to create a proxy to rewrite headers didn't work for me. The documented:

proxy.on('proxyReq', function(proxyReq, req, res, options) { proxyReq.setHeader('X-Special-Proxy-Header', 'foobar'); });

instead seems to work better as:

proxy.on('proxyReq', function(proxyReq, req, res, options) { res.setHeader(header, "*"); });