feat: add total supply to daily statistic

db/migrate/20200427073824_add_total_supply_to_daily_statistic.rb

@@ -0,0 +1,5 @@
+class AddTotalSupplyToDailyStatistic < ActiveRecord::Migration[6.0]
+  def change
+    add_column :daily_statistics, :total_supply, :decimal, precision: 30
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2020_04_27_041823) do
+ActiveRecord::Schema.define(version: 2020_04_27_073824) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"