revendore with auth 0.4.1, fix yandex auth provider bug

backend/vendor/github.com/go-pkgz/auth/README.md

@@ -21,7 +21,7 @@ This library provides "social login" with Github, Google, Facebook and Yandex as
 
 ## Install
 
-`go install github.com/go-pkgz/auth`
+`go get -u github.com/go-pkgz/auth`
 
 ## Usage
 

backend/vendor/github.com/go-pkgz/auth/auth.go

@@ -202,7 +202,7 @@ func (s *Service) AddProvider(name string, cid string, csecret string) {
 	case "facebook":
 		s.providers = append(s.providers, provider.NewService(provider.NewFacebook(p)))
 	case "yandex":
-		s.providers = append(s.providers, provider.NewService(provider.NewFacebook(p)))
+		s.providers = append(s.providers, provider.NewService(provider.NewYandex(p)))
 	case "dev":
 		s.providers = append(s.providers, provider.NewService(provider.NewDev(p)))
 	default:

backend/vendor/github.com/go-pkgz/auth/token/user.go

@@ -73,6 +73,23 @@ func (u *User) IsAdmin() bool {
 	return u.BoolAttr(adminAttr)
 }
 
+// SliceAttr gets slice attribute
+func (u *User) SliceAttr(key string) []string {
+	r, ok := u.Attributes[key].([]string)
+	if !ok {
+		return []string{}
+	}
+	return r
+}
+
+// SetSliceAttr sets boolean attribute
+func (u *User) SetSliceAttr(key string, val []string) {
+	if u.Attributes == nil {
+		u.Attributes = map[string]interface{}{}
+	}
+	u.Attributes[key] = val
+}
+
 // HashID tries to hash val with hash.Hash and fallback to crc if needed
 func HashID(h hash.Hash, val string) string {