Comply with Golang semantic import versioning (#630)

* Code: compatible with semantic import versioning

* Tools & Docs: compatible with semantic import versioning

* Clean go.mod & go.sum

pkg/auth/auth_test.go

@@ -1,12 +1,13 @@
 package auth
 
 import (
-	"github.com/HFO4/cloudreve/pkg/util"
-	"github.com/stretchr/testify/assert"
 	"io/ioutil"
 	"net/http"
 	"strings"
 	"testing"
+
+	"github.com/cloudreve/Cloudreve/v3/pkg/util"
+	"github.com/stretchr/testify/assert"
 )
 
 func TestSignURI(t *testing.T) {