Update README-JP.md

Author: quangctkm9207

README-JP.md

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 [English](https://github.com/aromajoin/controller-sdk-java) / [日本語](README-JP.md)
 
-# ControllerSDK - Java版 · [ ![Download](https://api.bintray.com/packages/aromajoin/maven/com.aromajoin.sdk%3Ajvm/images/download.svg) ](https://bintray.com/aromajoin/maven/com.aromajoin.sdk%3Ajvm/_latestVersion) [![License](https://img.shields.io/badge/license-Apache%202-4EB1BA.svg?style=flat-square)](https://www.apache.org/licenses/LICENSE-2.0.html)
+# ControllerSDK - Java版 · [ ![Download](https://api.bintray.com/packages/aromajoin/maven/com.aromajoin.sdk%3Ajvm/images/download.svg) ](https://bintray.com/aromajoin/maven/com.aromajoin.sdk%3Ajvm/_latestVersion) [![License](https://img.shields.io/badge/license-Apache%202-4EB1BA.svg?style=flat-square)](https://www.apache.org/licenses/LICENSE-2.0.html) [![Join the community on Spectrum](https://withspectrum.github.io/badge/badge.svg)](https://spectrum.chat/aromajoin-software/)
 
 **[Aroma Shooter](https://aromajoin.com/products/aroma-shooter)との通信に使用されるAromaShooterController SDKのJava版です。**