How to convert map keys from atoms to string in Elixir

What is the way to convert
[ %{id: 7, name: "A", count: 1}, %{id: 8, name: "B", count: 1}, %{id: 9, name: "C", count: 0} ]
to
[ %{"id" => "7", "name" => "A", "count" => "1"}, %{"id" => "8", "name" => "B", "count" => "1"}, %{"id" => "9", "name" => "C", "count" => "0"} ]
in Elixir?
Can any one help me?