Add demo.gif

README.md

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 [![Go Report Card](https://goreportcard.com/badge/github.com/nao1215/gup)](https://goreportcard.com/report/github.com/nao1215/gup)
 ![GitHub](https://img.shields.io/github/license/nao1215/gup)  
 [[日本語](./doc/ja/README.md)]  
+
+![demo](./doc/img/demo.gif)
 # gup - Update binaries installed by "go install"
-**gup** command update binaries installed by "go install" to the latest version. gup updates all binaries in parallel, so very fast. It also provides subcommands for manipulating binaries under \$GOPATH/bin (\$GOBIN). It is a cross-platform software that runs on Windows, Mac and Linux.
+**gup** command update binaries installed by "go install" to the latest version. gup updates all binaries in parallel, so very fast. It also provides subcommands for manipulating binaries under \$GOPATH/bin (\$GOBIN). It is a cross-platform software that runs on Windows, Mac and Linux.  
+
 ![sample](./doc/img/sample.png)
 
 gup command will notify you on your desktop whether the update was successful or unsuccessful after the update was finished.  

doc/ja/README.md

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 [![Build](https://github.com/nao1215/gup/actions/workflows/build.yml/badge.svg)](https://github.com/nao1215/gup/actions/workflows/build.yml)
 [![UnitTest](https://github.com/nao1215/gup/actions/workflows/unit_test.yml/badge.svg)](https://github.com/nao1215/gup/actions/workflows/unit_test.yml)
 [![reviewdog](https://github.com/nao1215/gup/actions/workflows/reviewdog.yml/badge.svg)](https://github.com/nao1215/gup/actions/workflows/reviewdog.yml)
+
+![demo](../img/demo.gif)
 # gupとは
 **gup**コマンドは、"go install"でインストールしたバイナリを最新版にアップデートします。gupは、すべてのバイナリを並列にアップデートするので、非常に高速です。\$GOPATH/bin (\$GOBIN) 以下にあるバイナリを操作するためのサブコマンドも提供しています。クロスプラットホームソフトであり、Windows, Mac, Linux で動作します。日本語版のみ、[Zenn](https://zenn.dev/articles/aef3fe318848d6/edit)に補足記事があります。
+
 ![sample](../img/sample.png)
 
 gupコマンドはアップデートが終わった後、成功したか失敗したかをデスクトップ通知します。