- store ammo type grain as integer

- make ammo type desc as text

priv/repo/migrations/20210903015537_create_ammo_types.exs

@@ -5,10 +5,10 @@ defmodule Cannery.Repo.Migrations.CreateAmmoTypes do
     create table(:ammo_types, primary_key: false) do
       add :id, :binary_id, primary_key: true
       add :name, :string
-      add :desc, :string
+      add :desc, :text
       add :case_material, :string
       add :bullet_type, :string
-      add :weight, :float
+      add :grain, :integer
       add :manufacturer, :string
 
       timestamps()