fix: prevent users from settings a growthfactor=1

- This always causes errors, it should not be possible.

settings.go

@@ -49,10 +49,10 @@ func MinimumLoad(value float64) Option {
 }
 
 // GrowthFactor controls how much the capacity of the [Table] multiplies when
-// it must resize. The value must be greater than 0.
+// it must resize. The value must be greater than 1.
 func GrowthFactor(value int) Option {
-	if value <= 0 {
-		panic(fmt.Sprintf("go-cuckoo: GrowthFactor must be greater than 0, got %d", value))
+	if value < 2 {
+		panic(fmt.Sprintf("go-cuckoo: GrowthFactor must be greater than 1, got %d", value))
 	}
 
 	return func(s *settings) { s.growthFactor = uint64(value) }