Fix the build

[mnapoli]

Since Symfony 4.2 was released the phpstan build is broken with these errors:

Parameter #1 $command of class Symfony\Component\Process\Process constructor expects array, string given.

See https://travis-ci.com/mnapoli/bref/jobs/162831081

Since I'm focused on the benchmarks and v0.3 that would be awesome if someone were to send a pull request to fix this. While I don't want to say this is easy I have to say this shouldn't be extra hard: the string parameter should be changed to an array (split each argument). A good way to get started contributing ;)

[incoming-th]

I was working on that. Fixing phpstan is easy but other issues are appearing during phpunit.

I will make a PR for the fix in phpstan but build will still fail because of phpunit issues and are pretty weird ... at least for me for now.

[mnapoli]

👍 ok I wasn't expecting that, thanks anything that improves the situation is good.

[incoming-th]

I only focused on phpstan PR #108

I also added the phpunit errors if relevant for another issue into the PR.