Merge branch...

Merge branch '42172-deprecation-warning-timestamps-was-called-without-specifying-an-option-for-null-in-rails-5-this-behavior-will-change-to-null-false' into 'master'

Resolve "DEPRECATION WARNING: `#timestamps` was called without specifying an option for `null`. In Rails 5, this behavior will change to `null: false`..."

Closes #42172

See merge request gitlab-org/gitlab-ce!16545

db/migrate/20170425112128_create_pipeline_schedules_table.rb

@@ -17,7 +17,7 @@ class CreatePipelineSchedulesTable < ActiveRecord::Migration
       t.boolean :active, default: true
       t.datetime :deleted_at
 
-      t.timestamps
+      t.timestamps null: true
     end
 
     add_index(:ci_pipeline_schedules, :project_id)