機能 #289
みぞ @mizo0203 さんが6年以上前に更新
https://developers.line.me/ja/docs/messaging-api/reference/#anchor-36ddabf319927434df30f0a74e21ad2cc69f0013
https://github.com/line/line-bot-sdk-java/blob/master/line-bot-api-client/src/main/java/com/linecorp/bot/client/LineMessagingClient.java