Specify Twig package in the required dependencies

[emulienfou]

Q	A
Branch?	2..x/master
Bug fix?	yes
New feature?	no
BC breaks?	no
Deprecations?	no
Tests pass?	yes
Fixed tickets	#1272
License	MIT

Add missing required version of twig/twig package.
Due to the use of apply tag, Twig package versions need to be added.

According to the Twig documentations here:

• https://twig.symfony.com/doc/1.x/tags/apply.html
• https://twig.symfony.com/doc/2.x/tags/apply.html
• https://twig.symfony.com/doc/3.x/tags/apply.html

Twig required versions are: 1.40, 2.9 and 3.0.

[Tobion]

I think twig was meant as an optional dependency which is why it wasn't required. People could use php templating instead. But since php templating has been removed almost in newer symfony versions, it seems fine to require twig here.

[dbu]

thank you!