Fix method visibility issues

All of these were caught by the spec_plugin_vis rake task.

lib/sequel/extensions/auto_cast_date_and_time.rb

@@ -45,8 +45,6 @@
 #
 module Sequel
  module AutoCastDateAndTime
- private
-
  # :nocov:
 
  # Mark the datasets as requiring sql standard date times. This is only needed
@@ -57,6 +55,8 @@ def requires_sql_standard_datetimes?
  end
  # :nocov:
 
+ private
+
  # Explicitly cast SQLTime time objects to TIME.
  def literal_sqltime_append(sql, v)
  sql << "TIME "

spec/extensions/pg_array_spec.rb

@@ -8,13 +8,14 @@
  before do
  @db = Sequel.connect('mock://postgres')
  @db.extend_datasets(Module.new do
+ def quote_identifiers?; false end
+ private
  def default_time_format
  "'%H:%M:%S'"
  end
  def default_timestamp_format
  "'%Y-%m-%d %H:%M:%S'"
  end
- def quote_identifiers?; false end
  end)
  @db.extension(:pg_array)
  @m = Sequel::Postgres

spec/extensions/pg_multirange_spec.rb

@@ -11,13 +11,14 @@ def @db.server_version(*) 140000 end
  @R = Sequel::Postgres::PGRange
  @MR = Sequel::Postgres::PGMultiRange
  @db.extend_datasets do
+ def quote_identifiers?; false end
+ private
  def default_time_format
  "'%H:%M:%S'"
  end
  def default_timestamp_format
  "'%Y-%m-%d %H:%M:%S'"
  end
- def quote_identifiers?; false end
  end
  @db.extension(:pg_array, :pg_multirange)
  end

spec/extensions/pg_range_spec.rb

@@ -9,13 +9,14 @@
  @db = Sequel.connect('mock://postgres')
  @R = Sequel::Postgres::PGRange
  @db.extend_datasets do
+ def quote_identifiers?; false end
+ private
  def default_time_format
  "'%H:%M:%S'"
  end
  def default_timestamp_format
  "'%Y-%m-%d %H:%M:%S'"
  end
- def quote_identifiers?; false end
  end
  @db.extension(:pg_array, :pg_range)
  end