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/thumb/image.go

@@ -3,8 +3,6 @@ package thumb
 import (
 	"errors"
 	"fmt"
-	model "github.com/HFO4/cloudreve/models"
-	"github.com/HFO4/cloudreve/pkg/util"
 	"image"
 	"image/gif"
 	"image/jpeg"
@@ -13,6 +11,9 @@ import (
 	"path/filepath"
 	"strings"
 
+	model "github.com/cloudreve/Cloudreve/v3/models"
+	"github.com/cloudreve/Cloudreve/v3/pkg/util"
+
 	"github.com/nfnt/resize"
 )