fix snow id bug (#43)

* fix snow id bug

* fix unit test

Author: szpnygo

utils/snow/snow.go

@@ -23,6 +23,7 @@ func getNodeID() int64 {
 func NewSnowNode() (*snowflake.Node, error) {
 	nodeID := getNodeID()
 	snowflake.NodeBits = 16
+	snowflake.StepBits = 6
 	sf, err := snowflake.NewNode(nodeID)
 	if err != nil {
 		return nil, err

utils/snow/snow_test.go

@@ -48,6 +48,7 @@ func Test_getNodeID(t *testing.T) {
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			snowflake.NodeBits = 16
+			snowflake.StepBits = 6
 			sf, err := snowflake.NewNode(tt.nodeID)
 
 			if (err != nil) != tt.wantErr {