Add Discord invite link to readme.

Author: sheabunge

src/readme.txt

@@ -31,6 +31,7 @@ https://youtu.be/uzND-wdSCMQ
 
 * [Support Forum](https://wordpress.org/support/plugin/code-snippets)
 * [Facebook Community](https://facebook.com/groups/codesnippetsplugin)
+* [Discord Community](https://snipco.de/discord)
 * [GitHub Repository](https://github.com/codesnippetspro/code-snippets)
 
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