Merge pull request #13593 from oliveiraethales/store_yaml_coder

Fix: ActiveRecord::Store TypeError conversion when using YAML coder
Conflicts:
	activerecord/CHANGELOG.md
	activerecord/lib/active_record/store.rb
	activerecord/test/schema/schema.rb
Merge pull request #13617 from arthurnn/error_var

Add 'e' var on rescue DalliError, in order to log it
doc backport for getting started - "Showing Posts" section. [ci skip]

Closes #13619.
Merge pull request #13355 from dylanahsmith/migration-version

activerecord: Initialize Migration with version from MigrationProxy.

Conflicts:
	activerecord/CHANGELOG.md

Conflicts:
	activerecord/CHANGELOG.md
Merge pull request #13597 from prathamesh-sonpatki/hstore_migration

Make change_table use object of current database adapter
Conflicts:
	activerecord/CHANGELOG.md
	activerecord/test/cases/adapters/postgresql/hstore_test.rb
Merge pull request #13657 from leriksen/master

[ci skip] - error_messages_for has been deprecated since 2.3.8 - lets re...
document implicit readonly. Closes #13660. [ci skip]

This behavior was removed for Rails `4.1` (aff928bacfb26f164c3f0ccbee7bcfa8228941cb).