Update CATALOG.md

Author: dcarbone

docs/CATALOG.md

@@ -1,7 +1,5 @@
 # PHP Consul API Catalog
 
-*This class is still under heavy development*
-
 All interactions with the [`v1/catalog`](https://www.consul.io/docs/agent/http/catalog.html) endpoint are done
 via the [CatalogClient](../src/Catalog/CatalogClient.php) class.
 
@@ -108,4 +106,4 @@ if (null !== $err)
     die($err);
 
 var_dump($err);
-```
+```