Add PHP 7.3 to the README as a supported version of PHP

ramsey · ramsey · commit 6e95e46cf503 · 2018-11-21T13:22:55.000-05:00
diff --git a/README.md b/README.md
@@ -29,6 +29,7 @@ The following versions of PHP are supported.
 * PHP 7.0
 * PHP 7.1
 * PHP 7.2
+* PHP 7.3
 
 ## Providers
 
