add clear tags

Author: Helperhaps

doc/api.md

@@ -358,6 +358,9 @@ $device->addTags($registration_id, ['tag1', 'tag2']);
 $device->removeTags($registration_id, 'tags');
 // OR
 $device->removeTags($registration_id,  ['tag1', 'tag2']);
+// 清空所有 tag
+$device->clearTags($registration_id);
+
 // 更新 mobile
 $device->updateMoblie($registration_id, '13800138000');
 

src/JPush/DevicePayload.php

@@ -34,6 +34,11 @@ public function updateMoblie($registration_id, $mobile) {
         return $this->updateDevice($registration_id, null, $mobile);
     }
 
+    public function clearTags($registration_id) {
+        $url = $this->client->makeURL('device') . $registrationId;
+        return Http::post($this->client, $url, [tags: '']);
+    }
+
     public function updateDevice($registrationId, $alias = null, $mobile = null, $addTags = null, $removeTags = null) {
         $payload = array();
         if (!is_string($registrationId)) {