v2.1

- bugfix

probability.go

@@ -14,7 +14,7 @@ func (x *Probability) First() (*Probability_Stamp, bool) {
 }
 
 func (x *Probability) Next(n int) (*Probability_Stamp, bool) {
-	if x.Stamps == nil || len(x.Stamps) < n {
+	if x.Stamps == nil || len(x.Stamps) <= n {
 		return nil, false
 	}