Allow tag relations + bump ecto deps

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

priv/repo/migrations/20190214100858_drop_datetimetz.exs

@@ -0,0 +1,48 @@
+defmodule Mobilizon.Repo.Migrations.DropDatetimetz do
+  use Ecto.Migration
+
+  def up do
+    alter table(:events) do
+      remove(:begins_on)
+      remove(:ends_on)
+      remove(:publish_at)
+      add(:begins_on, :utc_datetime)
+      add(:ends_on, :utc_datetime)
+      add(:publish_at, :utc_datetime)
+    end
+
+    alter table(:sessions) do
+      remove(:begins_on)
+      remove(:ends_on)
+      add(:begins_on, :utc_datetime)
+      add(:ends_on, :utc_datetime)
+    end
+
+    execute "DROP TYPE datetimetz"
+  end
+
+  def down do
+    execute("""
+    CREATE TYPE datetimetz AS (
+        dt timestamptz,
+        tz varchar
+    );
+    """)
+
+    alter table(:events) do
+      remove(:begins_on)
+      remove(:ends_on)
+      remove(:publish_at)
+      add(:begins_on, :datetimetz)
+      add(:ends_on, :datetimetz)
+      add(:publish_at, :datetimetz)
+    end
+
+    alter table(:sessions) do
+      remove(:begins_on)
+      remove(:ends_on)
+      add(:begins_on, :datetimetz)
+      add(:ends_on, :datetimetz)
+    end
+  end
+end