Update webelement.py

Author: KazuCocoa

appium/webdriver/webelement.py

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from typing import TYPE_CHECKING, Callable, Dict, Optional, Union
+from typing import TYPE_CHECKING, Callable, Dict, Optional, Union, List
 
 from selenium.webdriver.common.utils import keys_to_typing
 from selenium.webdriver.remote.command import Command as RemoteCommand