remove old pegjs version (0.6.2)
remove old pegjs version (0.6.2)

matthias-springer/amber-athens,amber-smalltalk/amber,adrian-castravete/amber,matthias-springer/amber-athens,adrian-castravete/amber,amber-smalltalk/amber,matthias-springer/amber-athens,amber-smalltalk/amber,adrian-castravete/amber