Update slack badge to discord (#28)

README.md

@@ -1,7 +1,7 @@
 # terramate-example-code-generation
 
 ![CI Status](https://github.com/mineiros-io/terramate-example-code-generation/actions/workflows/ci.yml/badge.svg)
-[![Join Slack](https://img.shields.io/badge/slack-@mineiros--community-f32752.svg?logo=slack)](https://mineiros.io/slack)
+[![Join Discord](https://img.shields.io/discord/1088753599951151154?label=Discord&logo=discord&logoColor=white)](https://terramate.io/discord)
 
 This project shows an example file/dir structure you can use with
 [Terramate](https://github.com/mineiros-io/terramate) to keep your Terraform