Make tests great again !

(Also use only one field for public/private key pem)
Signed-off-by: Thomas Citharel <tcit@tcit.fr>

priv/repo/migrations/20180607095732_add_uuid_to_comments.exs

@@ -0,0 +1,15 @@
+defmodule Eventos.Repo.Migrations.AddUUIDToComments do
+  use Ecto.Migration
+
+  def up do
+    alter table(:comments) do
+      add :uuid, :uuid
+    end
+  end
+
+  def down do
+    alter table(:comments) do
+      remove :uuid
+    end
+  end
+end