Fix cucumber_opts warning

[JuanVqz]

I was reading the Developing Reek Contributing to understand how reek works, then run the rake console and saw the warning message.

➜  reek git:(master) be rake console
WARNING: consider using an array rather than a space-delimited string with cucumber_opts to avoid undesired behavior.

after making it an array the warning was gone, let's see if that works for you.

[troessner]

Thanks for this, just checked it on my machine, seems to do the trick! If you rebase against master the rubocop failure will go away and we can merge this one ;)

[JuanVqz]

@troessner rebased!

[mvz]

Thanks, @JuanVqz!