Twig min version

[ghost]

Q	A
Branch	master
Bug fix?	yes/no
New feature?	no
BC breaks?	yes/no
Deprecations?	yes/no
Documented?	yes/no
Fixed tickets

With the default settings for the twigcs task in Grumphp we require the >=4.0 versions:

grumphp/src/Task/TwigCs.php

Lines 19 to 25 in b835400

	$resolver->setDefaults([
	'path' => '.',
	'severity' => 'warning',
	'ruleset' => 'FriendsOfTwig\Twigcs\Ruleset\Official',
	'triggered_by' => ['twig'],
	'exclude' => [],
	]);

Earlier version like ^3.0 have a different namespace:

https://github.com/friendsoftwig/twigcs/blob/7c4bc76dad8d851045b9eeab4979a240550f8300/src/Ruleset/Official.php#L3

For that I think it's best that we change the documentation line to require the >=4 version of this package.

[ghost]

PS: I realize that people could still want to use ^3.0 versions. But even the 3.2.0 version is broken if you use the correct namespace for the class. Still think it's best to go >=4 without making it too complicated for inexperienced users.

[veewee]

Makes sense to do it like this.
You can always use an older version and change the default namespace if you want to.

Thanks!