Add a game_states column to the database.

Author: Cheng20010201

priv/repo/migrations/20200402094115_add_user_game_states.exs

@@ -0,0 +1,11 @@
+defmodule Cadet.Repo.Migrations.AddUserGameStates do
+  use Ecto.Migration
+
+  def change do
+    alter table(:users) do
+      add(:game_states, :map, default: %{collectibles: %{}, save_data: %{
+        action_sequence: [], start_location: ""
+      }})
+    end
+  end
+end