CRATE PREVIEW: Activation and deactivation

[fernanACM]

Changes made:

     keys:
         id: 131
         meta: 0
         name: "{CRATE} Key"
         lore: "Claim rewards from a {CRATE} Crate"
     crates:
     # Options: instant, roulette
        mode: roulette
        roulette:
        # Minimum duration: (duration/speed) >= 5.5
        # If (duration/speed) ends up being less than 5.5, then your default time will be set to (6*speed)
        duration: 30
        # Minimum speed: speed >= 1
        # If speed ends up being less than 1, then your default speed will be set to 1.
        speed: 2
        #Crate preview:
        #Use "true" or "false" to disable or enable this option.
        preview: true