changelog update

changelog.md

@@ -1,5 +1,5 @@
 HEAD
-- BREAKING TRANSPORT POLICY CHANGE: Custom transport policies will now be 
+- BREAKING TRANSPORT POLICY CHANGE: Custom transport policies will now be
   required to include a new method `void set_uri(uri_ptr u)`. An implementation
   is not required. The stub transport policy includes an example stub method
   that can be pasted into any existing custom transport policy to fulfill this
@@ -7,10 +7,12 @@ HEAD
   configs.
 - BREAKING SOCKET POLICY CHANGE: Custom asio transport socket policies will now
   be required to include a new method `void set_uri(uri_ptr u)`. Like with the
-  transport layer, an implementation is not required. This does not affect 
+  transport layer, an implementation is not required. This does not affect
   anyone using the bundled socket policies.
 - Improvement: Outgoing TLS connections to servers using the SNI extension to
   choose a certificate will now work.
+- Feature: Adds a vectored/scatter-gather write handler to the iostream
+  transport.
 
 0.5.0 - 2015-01-22
 - BREAKING UTILITY CHANGE: Deprecated methods `http::parser::parse_headers`,