Actually send the corgi accepts header

Author: iarna

lib/request.js

@@ -112,15 +112,14 @@ function makeRequest (uri, params, cb_) {
   headers['accept-encoding'] = 'gzip'
 
   // metadata should be minified, if the registry supports it
-  headers['accept'] = 'application/vnd.npm.install-v1+json; q=1.0, application/json; q=0.8, */*'
 
   var er = this.authify(params.authed, parsed, headers, params.auth)
   if (er) return cb_(er)
 
   var opts = this.initialize(
     parsed,
     params.method,
-    'application/json',
+    'application/vnd.npm.install-v1+json; q=1.0, application/json; q=0.8, */*',
     headers
   )