docs: update single example

Signed-off-by: Bo-Yi Wu <[email protected]>

Author: appleboy

_example/single/go.mod

@@ -4,7 +4,7 @@ go 1.18
 
 require (
 	github.com/golang-queue/nats v0.0.2-0.20210822122542-200fdcf19ebf
-	github.com/golang-queue/queue v0.0.13-0.20220403053548-d431277d570f
+	github.com/golang-queue/queue v0.0.13-0.20220423025512-c4a8df54c917
 )
 
 require (

_example/single/go.sum

@@ -1,6 +1,7 @@
 github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
-github.com/golang-queue/queue v0.0.13-0.20220403053548-d431277d570f h1:Wioq3g97ssizNPQsPwdL61DIjePabPaq+XYo7z2t2Oc=
-github.com/golang-queue/queue v0.0.13-0.20220403053548-d431277d570f/go.mod h1:KD9age1s6nk8Evz3tfKHsk8k4LwA0htxQ7MS7rJPJzA=
+github.com/golang-queue/queue v0.0.13-0.20220423025512-c4a8df54c917 h1:+khkGHxQPsad/mfmgizoTc3Jh5UVdCp1OfUkDfW+uDQ=
+github.com/golang-queue/queue v0.0.13-0.20220423025512-c4a8df54c917/go.mod h1:g1yxxDl8JMo4gUfxt11fjjU3SXU1ah61EvwshmDoSIs=
+github.com/golang/mock v1.6.0 h1:ErTB+efbowRARo13NNdxyJji2egdxLGQhRaY+DUumQc=
 github.com/golang/protobuf v1.5.2 h1:ROPKBNFfQgOUMifHyP+KYbvpjbdoFNs+aK7DXlji0Tw=
 github.com/klauspost/compress v1.15.1 h1:y9FcTHGyrebwfP0ZZqFiaxTaiDnUrGkJkI+f583BL1A=
 github.com/klauspost/compress v1.15.1/go.mod h1:/3/Vjq9QcHkK5uEr5lBEmyoZ1iFhe47etQ6QUkpK6sk=

_example/single/main.go

@@ -9,6 +9,7 @@ import (
 
 	"github.com/golang-queue/nats"
 	"github.com/golang-queue/queue"
+	"github.com/golang-queue/queue/core"
 )
 
 type job struct {
@@ -32,7 +33,7 @@ func main() {
 		nats.WithAddr("127.0.0.1:4222"),
 		nats.WithSubj("example"),
 		nats.WithQueue("foobar"),
-		nats.WithRunFunc(func(ctx context.Context, m queue.QueuedMessage) error {
+		nats.WithRunFunc(func(ctx context.Context, m core.QueuedMessage) error {
 			var v *job
 			if err := json.Unmarshal(m.Bytes(), &v); err != nil {
 				return err