use-package set projectile option

[Florian Lindner <mailinglists@xgm.de>]

Hello,

I use use-package for package configuration

(use-package projectile
  :ensure t
  :config (progn
            (projectile-global-mode)
            (setq projectile-switch-project-action 'projectile-vc)
))

but the variable assignment is simply ignored. The variable retains the 
original value. I have tried variations of that like putting setq before the 
activaction or put in the iniit section, which is executed before the 
package load.

What is the right way? Why?

Thanks,
Florian