add changelog

Author: hellertang

.changelog/2757.txt

@@ -1,3 +1,7 @@
 ```release-note:enhancement
 data_source/tencentcloud_instances: add params `uuid`
 ```
+
+```release-note:enhancement
+resource/tencentcloud_vpn_gateway: add default value for `prepaid_period` while import
+```

tencentcloud/services/vpn/resource_tc_vpn_gateway.go

@@ -25,7 +25,9 @@ func ResourceTencentCloudVpnGateway() *schema.Resource {
 		Update: resourceTencentCloudVpnGatewayUpdate,
 		Delete: resourceTencentCloudVpnGatewayDelete,
 		Importer: &schema.ResourceImporter{
-			State: schema.ImportStatePassthrough,
+			State: helper.ImportWithDefaultValue(map[string]interface{}{
+				"prepaid_period": 1,
+			}),
 		},
 
 		Schema: map[string]*schema.Schema{