Composer update running out of memory on travis

[emteknetnz]

The composer v1 builds are running out memory. Composer v2 is fine.

https://travis-ci.com/github/silverstripe/silverstripe-installer

I think it's still worth keeping the composer v1 around for now since lots of people will still be using that

PRs

• silverstripe/silverstripe-travis-shared#18

[maxime-rainville]

PR has been merged. It's worth pointing out the stated future plan for composer 1. https://blog.packagist.com/deprecating-composer-1-support/