fix host header transform to support Host and host header

.travis.yml

@@ -1,4 +1,4 @@
 language: node_js
-sudo: false
 node_js:
     - "4"
+    - "6"

History.md

@@ -1,5 +1,6 @@
 # UNRELEASED
 
+* fix host header transform
 * update request dependency
 
 # 1.8.1 (2016-01-20)

lib/HeaderHostTransformer.js

@@ -24,7 +24,7 @@ HeaderHostTransformer.prototype._transform = function (chunk, enc, cb) {
     // we just become a regular passthrough
     if (!self.replaced) {
         chunk = chunk.toString();
-        self.push(chunk.replace(/(\r\nHost: )\S+/, function(match, $1) {
+        self.push(chunk.replace(/(\r\n[Hh]ost: )\S+/, function(match, $1) {
             self.replaced = true;
             return $1 + self.host;
         }));