[Deprecated] use filter spaceless instead tag

[Dev-Int]

Since Twig 2.7 tag spaceless is Deprecated use filter instead

[yceruto]

We should wait for apply tag instead.
twigphp/Twig#2977

[Dev-Int]

I think it was since twig/twig:^2.9 ?
I retry with apply tag

edit:
Unexpected "apply" tag (expecting closing tag for the "block" tag defined near line xx)

[xabbuh]

I agree with @yceruto about using the apply tag instead. This will also require to update the version constraint to ^2.9 in the composer.json file (merging should be delayed until there is a stable tag for that version in the Twig repository though).

[Dev-Int]

What a pity for my first contribution....
Thanks for your help @xabbuh , @yceruto .
I close this PR until @xabbuh suggest:

I agree with @yceruto about using the apply tag instead. This will also require to update the version constraint to ^2.9 in the composer.json file (merging should be delayed until there is a stable tag for that version in the Twig repository though).

[xabbuh]

@Dev-Int You can reopen your PR nonetheless and already make these changes. My comment about the merge was more directed to us maintainers to be careful when to press the button. :) I am sorry it that was confusing.

[Dev-Int]

Ok @xabbuh . My English is not always on top.
I make the changes... and wait :p

[yceruto]

Twig 2.9 has been released.
I've rebuilt the Travis jobs.
We might need a patch for 1.x as well.

[javiereguiluz]

Thanks for fixing this deprecation!