[2.0] Fix runCommand PHPDoc

[Jean85]

This BC was introduced but hidden to static analyzers due to this PHPDoc error.

Maybe we should introduce static analysis in 2.0 CI?

[alexislefebvre]

Yes, adding static analysis tools is a great idea. FlintCI was added in #371 but I don't know why it doesn't work anymore (this PR has no check from FlintCI).

About this line, the whole PHPDoc block is redundant for this method, maybe we should drop it when it adds no value to the args and return type hints.

[Jean85]

• FlintCI is not working and neither Travis, we're out of CI checks! 😞 It seems to have stopped working evend mid-PR in Dependencies upgrade #379
• superfluous PHPDoc could be suppressed using PHP-CS-Fixer, with the `` rule
• on that regard, I don't see PHP-CS-Fixer required in dev or even run in CI; I see that we have StyleCI, but the config is out of sync with the committed one, that's not good!
• I can introduce PHPStan in the CI checks, I'll work on a PR ASAP; I think we should move the CS check there too, leveraging Travis' stages

[alexislefebvre]

Great news Jean, see #468.