update thread reply

lib/myapp/data/util.ex

@@ -1,11 +1,13 @@
 defmodule MyApp.Data.Util do
 
+  @spec map_changeset(map) :: map
   def map_changeset(changeset) do
     Enum.map(changeset.errors, fn {key, val} ->
       %{key => elem(val, 0)}
     end)
   end
 
+  @spec process_insert_or_update({atom, map}) :: {:ok, map} | {:error, map}
   def process_insert_or_update({:error, changeset}), do: {:error, map_changeset(changeset)}
   def process_insert_or_update({:ok, data}), do: {:ok, data}