Updated Discord invite to use vanity URL

Author: davidcole1340

README.md

@@ -2,7 +2,7 @@
 
 Bindings for the Zend API to build PHP extensions natively in Rust. Inspired by [killertux/solder](https://github.com/killertux/solder) and its predecessors.
 
-[![PHP Discorders](https://discord.com/api/guilds/115233111977099271/widget.png?style=banner1)](https://discord.gg/0duG4FF1ElFGUFVq)
+[![PHP Discorders](https://discord.com/api/guilds/115233111977099271/widget.png?style=banner1)](https://discord.gg/dphp)
 
 ## Features