improve grand.Intn; README updates
@@ -66,6 +66,7 @@ func main() {
# Contributors
+- [aloncn](https://github.com/aloncn)
- [chenyang351](https://github.com/chenyang351)
- [garfieldkwong](https://gitee.com/garfieldkwong)
- [hailaz](https://gitee.com/hailaz)
