新增go modules支持，自行管理第三方包依赖，方便开发者使用

g/encoding/gcharset/gcharset.go

@@ -11,7 +11,7 @@
 package gcharset
 
 import (
-	"github.com/axgle/mahonia"
+	"gitee.com/johng/gf/third/github.com/axgle/mahonia"
 	"errors"
 	"fmt"
 )

g/encoding/ghtml/ghtml.go

@@ -10,7 +10,7 @@ package ghtml
 import (
     "strings"
     "html"
-    "github.com/grokify/html-strip-tags-go"
+    "gitee.com/johng/gf/third/github.com/grokify/html-strip-tags-go"
 )
 
 // 过滤掉HTML标签，只返回text内容

g/encoding/gtoml/gtoml.go

@@ -10,7 +10,7 @@ package gtoml
 import (
     "bytes"
     "encoding/json"
-    "github.com/BurntSushi/toml"
+    "gitee.com/johng/gf/third/github.com/BurntSushi/toml"
 )
 
 func Encode(v interface{}) ([]byte, error) {

g/encoding/gxml/gxml.go

@@ -8,11 +8,11 @@
 package gxml
 
 import (
-    "github.com/clbanning/mxj"
+    "gitee.com/johng/gf/third/github.com/clbanning/mxj"
     "encoding/xml"
     "io"
 	"gitee.com/johng/gf/g/util/gregex"
-	"github.com/axgle/mahonia"
+	"gitee.com/johng/gf/third/github.com/axgle/mahonia"
 	"errors"
 	"fmt"
 	"strings"

g/encoding/gyaml/gyaml.go

@@ -7,7 +7,7 @@
 // YAML
 package gyaml
 
-import "github.com/ghodss/yaml"
+import "gitee.com/johng/gf/third/github.com/ghodss/yaml"
 
 func Encode(v interface{}) ([]byte, error) {
     return yaml.Marshal(v)