removes unused column [#5]

db/migrate/20150716154501_remove_external_link_from_debates.rb

@@ -0,0 +1,5 @@
+class RemoveExternalLinkFromDebates < ActiveRecord::Migration
+  def change
+    remove_column :debates, :external_link
+  end
+end

db/schema.rb

@@ -11,12 +11,11 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20150715190041) do
+ActiveRecord::Schema.define(version: 20150716154501) do
 
   create_table "debates", force: :cascade do |t|
     t.string   "title"
     t.text     "description"
-    t.string   "external_link"
     t.integer  "author_id"
     t.datetime "created_at",  null: false
     t.datetime "updated_at",  null: false