Update README.md

Author: RelaxTools

README.md

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   <h2 align="center">RelaxTools Addin For Excel 2013/2016/2019/Office365</h2>
   <p align="center">各種変換、編集、検索などの機能追加を行うツールです。</p>
   <p align="center">Copyright(C) Yasuhiro Watanabe 2009</p>