fix(file): remove deprecated POST /files/:name invocation

Author: weakish

leancloud/file_.py

@@ -245,16 +245,9 @@ def _save_external(self):
             "mime_type": self.mime_type,
             "url": self._url,
         }
-        response = client.post("/files/{0}".format(self._name), data)
+        response = client.post("/files".format(self._name), data)
         content = response.json()
-
-        self._name = content["name"]
-        self._url = content["url"]
         self.id = content["objectId"]
-        if "size" in content:
-            self._metadata["size"] = content["size"]
-        else:
-            raise ValueError
 
     def _save_to_qcloud(self, token, upload_url):
         headers = {