Add map to sidebar on Heading's page

Signed-off-by: Matheus Miranda <matheusmirandalacerda@gmail.com>

db/migrate/20181109111037_add_location_to_headings.rb

@@ -0,0 +1,6 @@
+class AddLocationToHeadings < ActiveRecord::Migration
+  def change
+    add_column :budget_headings, :latitude, :text
+    add_column :budget_headings, :longitude, :text
+  end
+end