Update README.md with instructions on how to read cookies

README.md

@@ -184,6 +184,17 @@ iex> HTTPoison.get!("http://httparrot.herokuapp.com/cookies", %{}, hackney: [coo
  status_code: 200}
 ```
 
+You can also receive cookies from the server by reading the `"set-cookie"` headers in the response:
+
+```elixir
+iex(1)> response = HTTPoison.get!("http://httparrot.herokuapp.com/cookies/set?foo=1")
+iex(2)> cookies = Enum.filter(response.headers, fn       
+...(2)> {"Set-Cookie", _} -> true
+...(2)> _ -> false
+...(2)> end)
+[{"Set-Cookie", "foo=1; Version=1; Path=/"}]
+```
+
 You can see more usage examples in the test files (located in the
 [`test/`](test)) directory.