Switch chat badge to point to palatable discord

README.md

@@ -2,7 +2,7 @@
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 [![Actions Status](https://github.com/palatable/lambda/workflows/Java%20CI/badge.svg)](https://github.com/palatable/lambda/actions)
 [![Lambda](https://img.shields.io/maven-central/v/com.jnape.palatable/lambda.svg)](http://search.maven.org/#search%7Cga%7C1%7Ccom.jnape.palatable.lambda)
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 Functional patterns for Java