Merge branch 'master' into glitch-soc/merge-upstream

Conflicts:
- app/models/media_attachment.rb
  Upstream raised max image size from 8MB to 10MB while our limit is
  configurable. Raised the default to 10MB.

db/migrate/20191001213028_add_lock_version_to_account_stats.rb

@@ -0,0 +1,15 @@
+require Rails.root.join('lib', 'mastodon', 'migration_helpers')
+
+class AddLockVersionToAccountStats < ActiveRecord::Migration[5.2]
+  include Mastodon::MigrationHelpers
+
+  disable_ddl_transaction!
+
+  def up
+    safety_assured { add_column_with_default :account_stats, :lock_version, :integer, allow_null: false, default: 0 }
+  end
+
+  def down
+    remove_column :account_stats, :lock_version
+  end
+end