Merge 20191117042320_add_cost_field_to_charges.exs (Charge Cost field) (#258)

* Create 20191117042320_add_cost_field_to_charges.exs

* Update 20191117042320_add_cost_field_to_charges.exs

Add end block

* Update 20191117042320_add_cost_field_to_charges.exs

Fix type definition and correct table (thanks @adriankumpf!)

* Update 20191117042320_add_cost_field_to_charges.exs

Resolve required mix formatting

priv/repo/migrations/20191117042320_add_cost_field_to_charges.exs

@@ -0,0 +1,9 @@
+defmodule TeslaMate.Repo.Migrations.AddCostFieldToCharges do
+  use Ecto.Migration
+
+  def change do
+    alter table(:charging_processes) do
+      add(:cost, :decimal, precision: 6, scale: 2)
+    end
+  end
+end