add cookie methods to HttpResponse

CHANGES.md

@@ -4,6 +4,8 @@
 
 ### Added
 
+* Add methods to `HttpResponse` to retrieve, add, and delete cookies
+
 * Add `.set_content_type()` and `.set_content_disposition()` methods
   to `fs::NamedFile` to allow overriding the values inferred by default
 
@@ -22,6 +24,9 @@
 
 * Min rustc version is 1.26
 
+* `HttpResponse::into_builder()` now moves cookies into the builder
+  instead of dropping them
+
 * Use tokio instead of tokio-core
 
 * Use `&mut self` instead of `&self` for Middleware trait