Fixed minor typo

instead of 'rake test' as shortcut, use 'rake'.

Closes #12780 [ci skip]
Use arel 4-0-stable branch
Merge pull request #12749 from iantropov/issue_5303

Add test for ActiveRecord::Relation YAML serialization, for #5303 issue
Merge pull request #12740 from gaurish/patch-1

Improve Errors when Controller Name or Action isn't specfied
Merge pull request #12834 from dredozubov/has_one_association_replacement

Fixes problem with replacing has_one association record with itself
Conflicts:
	activerecord/CHANGELOG.md
tidy Active Record CHANGELOG. [ci skip].
Fixed typo in migrations guide [ci skip]
Update security.md [ci skip]
updated documentation for Integer [ci skip]
Merge pull request #12748 from dm1try/fix_counter_cache_for_through_association

Fixes #11079, prevent the counter cache from being decremented twice when destroying a record on a has_many :through association
Conflicts:
	activerecord/CHANGELOG.md
`remove_column` does not take a type argument. [ci skip]. Closes #12864
Revert "`remove_column` does not take a type argument. [ci skip]. Closes #12864"

As of Rails 4.0 `remove_column` is no longer an alias for `remove_columns`.
The type is actually valid and used when issuing a rollback (new `change` method).

This reverts commit 6a5e3647a8bfdca7ece7db30508a8b5db9709426.
Merge pull request #12870 from sauliusg/atom-feed-doc-fix

Fix syntax error in atom_feed example [ci skip]
Merge pull request #12845 from amatsuda/should_ar_depend_on_rails

Refer to Rails.env from AR only when Rails is defined
Conflicts:
	activerecord/lib/active_record/migration.rb
document id prefixed String usage of `.find`. refs #12891 [ci skip]
The option is called encode_big_decimal_as_string [ci skip]
Merge pull request #12906 from chancancode/use_standard_json_big_decimal_format-4-0-stable

(Doc fix) Backport ActiveSupport.encode_big_decimal_as_string doc fix to 4-0-stable [ci skip]
Merge pull request #12904 from sbagdat/patch-1

Change Relation#all to Relation#load [ci skip]
Merge pull request #12703 from makimoto/actionsupport-error-set_backtrace

Use set_backtrace instead of @backtrace in ActionView error
Conflicts:
	actionview/CHANGELOG.md
Merge pull request #12916 from petervandenabeele/typo_4_0_release_notes

[ci skip] typo in ArgumentError in 4_0_release_notes.md