迁移文件合并

db/migrate/20190517080313_add_test_set_average_for_challenges.rb

@@ -1,5 +1,5 @@
 class AddTestSetAverageForChallenges < ActiveRecord::Migration[5.2]
   def change
-    add_column :challenges, :test_set_average, :boolean, :default => false
+    add_column :challenges, :test_set_average, :boolean, :default => true
   end
 end

db/migrate/20190517083326_change_test_set_averger_for_challenges.rb

@@ -1,5 +0,0 @@
-class ChangeTestSetAvergerForChallenges < ActiveRecord::Migration[5.2]
-  def change
-    change_column :challenges, :test_set_average, :boolean, :default => true
-  end
-end