chore(README): modify slack badge

README-CN.md

@@ -4,7 +4,7 @@
 [![Build Status](https://travis-ci.org/emqx/emqx.svg)](https://travis-ci.org/emqx/emqx)
 [![Coverage Status](https://coveralls.io/repos/github/emqx/emqx/badge.svg)](https://coveralls.io/github/emqx/emqx)
 [![Docker Pulls](https://img.shields.io/docker/pulls/emqx/emqx)](https://hub.docker.com/r/emqx/emqx)
-[![Slack Invite](<https://slack-invite.emqx.io/badge.svg>)](https://slack-invite.emqx.io)
+[![Slack](https://img.shields.io/badge/Slack-EMQ%20X-39AE85?logo=slack)](https://slack-invite.emqx.io/)
 [![Twitter](https://img.shields.io/badge/Twitter-EMQ-1DA1F2?logo=twitter)](https://twitter.com/EMQTech)
 [![Community](https://img.shields.io/badge/Community-EMQ%20X-yellow)](https://askemq.com)
 [![YouTube](https://img.shields.io/badge/Subscribe-EMQ%20中文-FF0000?logo=youtube)](https://www.youtube.com/channel/UCir_r04HIsLjf2qqyZ4A8Cg)

README-JP.md

@@ -4,7 +4,7 @@
 [![Build Status](https://travis-ci.org/emqx/emqx.svg)](https://travis-ci.org/emqx/emqx)
 [![Coverage Status](https://coveralls.io/repos/github/emqx/emqx/badge.svg)](https://coveralls.io/github/emqx/emqx)
 [![Docker Pulls](https://img.shields.io/docker/pulls/emqx/emqx)](https://hub.docker.com/r/emqx/emqx)
-[![Slack Invite](<https://slack-invite.emqx.io/badge.svg>)](https://slack-invite.emqx.io)
+[![Slack](https://img.shields.io/badge/Slack-EMQ%20X-39AE85?logo=slack)](https://slack-invite.emqx.io/)
 [![Twitter](https://img.shields.io/badge/Twitter-EMQ-1DA1F2?logo=twitter)](https://twitter.com/EMQTech)
 [![YouTube](https://img.shields.io/badge/Subscribe-EMQ-FF0000?logo=youtube)](https://www.youtube.com/channel/UC5FjR77ErAxvZENEWzQaO5Q)
 

README-RU.md

@@ -4,7 +4,7 @@
 [![Build Status](https://travis-ci.org/emqx/emqx.svg)](https://travis-ci.org/emqx/emqx)
 [![Coverage Status](https://coveralls.io/repos/github/emqx/emqx/badge.svg?branch=master)](https://coveralls.io/github/emqx/emqx?branch=master)
 [![Docker Pulls](https://img.shields.io/docker/pulls/emqx/emqx)](https://hub.docker.com/r/emqx/emqx)
-[![Slack Invite](<https://slack-invite.emqx.io/badge.svg>)](https://slack-invite.emqx.io)
+[![Slack](https://img.shields.io/badge/Slack-EMQ%20X-39AE85?logo=slack)](https://slack-invite.emqx.io/)
 [![Twitter](https://img.shields.io/badge/Follow-EMQ-1DA1F2?logo=twitter)](https://twitter.com/EMQTech)
 [![Community](https://img.shields.io/badge/Community-EMQ%20X-yellow?logo=github)](https://github.com/emqx/emqx/discussions)
 [![YouTube](https://img.shields.io/badge/Subscribe-EMQ-FF0000?logo=youtube)](https://www.youtube.com/channel/UC5FjR77ErAxvZENEWzQaO5Q)

README.md

@@ -4,7 +4,7 @@
 [![Build Status](https://travis-ci.org/emqx/emqx.svg)](https://travis-ci.org/emqx/emqx)
 [![Coverage Status](https://coveralls.io/repos/github/emqx/emqx/badge.svg?branch=master)](https://coveralls.io/github/emqx/emqx?branch=master)
 [![Docker Pulls](https://img.shields.io/docker/pulls/emqx/emqx)](https://hub.docker.com/r/emqx/emqx)
-[![Slack Invite](<https://slack-invite.emqx.io/badge.svg>)](https://slack-invite.emqx.io)
+[![Slack](https://img.shields.io/badge/Slack-EMQ%20X-39AE85?logo=slack)](https://slack-invite.emqx.io/)
 [![Twitter](https://img.shields.io/badge/Follow-EMQ-1DA1F2?logo=twitter)](https://twitter.com/EMQTech)
 [![YouTube](https://img.shields.io/badge/Subscribe-EMQ-FF0000?logo=youtube)](https://www.youtube.com/channel/UC5FjR77ErAxvZENEWzQaO5Q)