docs: add badge for IRC on the readme (#205)

README.md

@@ -1,5 +1,5 @@
 # ![Kosmorro](https://raw.githubusercontent.com/Kosmorro/logos/main/png/kosmorro-logo-grey.png)
-[![Coverage Status](https://coveralls.io/repos/github/Kosmorro/kosmorro/badge.svg?branch=master)](https://coveralls.io/github/Kosmorro/kosmorro?branch=master) [![Version on PyPI](https://img.shields.io/pypi/v/kosmorro)](https://pypi.org/project/kosmorro) [![Packaging status](https://repology.org/badge/tiny-repos/kosmorro.svg)](https://repology.org/project/kosmorro/versions) [![Docker Pulls](https://img.shields.io/docker/pulls/kosmorro/kosmorro)](https://hub.docker.com/r/kosmorro/kosmorro) [![Help translating Kosmorro!](https://hosted.weblate.org/widgets/kosmorro/-/cli/svg-badge.svg)](https://hosted.weblate.org/engage/kosmorro/) [![Discord](https://img.shields.io/discord/650237632533757965?logo=discord&label=%23kosmorro)](https://discord.gg/TVX4MSKGaa)
+[![Coverage Status](https://coveralls.io/repos/github/Kosmorro/kosmorro/badge.svg?branch=master)](https://coveralls.io/github/Kosmorro/kosmorro?branch=master) [![Version on PyPI](https://img.shields.io/pypi/v/kosmorro)](https://pypi.org/project/kosmorro) [![Packaging status](https://repology.org/badge/tiny-repos/kosmorro.svg)](https://repology.org/project/kosmorro/versions) [![Docker Pulls](https://img.shields.io/docker/pulls/kosmorro/kosmorro)](https://hub.docker.com/r/kosmorro/kosmorro) [![Help translating Kosmorro!](https://hosted.weblate.org/widgets/kosmorro/-/cli/svg-badge.svg)](https://hosted.weblate.org/engage/kosmorro/) [![IRC: #kosmorro on Libera.Chat](https://img.shields.io/badge/Libera.Chat-%23kosmorro-blueviolet)](https://web.libera.chat/?nick=Astronaut?#kosmorro)
 
 A program that calculates your astronomical ephemerides!