update readme

lifeofguenter · lifeofguenter · commit 098738aa5503 · 2014-08-28T14:59:22.000+02:00
diff --git a/README.md b/README.md
@@ -97,6 +97,7 @@ As soon as the module is loaded following `CONSTANTS` will be available, the usa
 - `RDNS_PTR`
 - `RDNS_TXT`
 - `RDNS_SVR`
+- `RDNS_SOA`
 
 
 ### RDNS::addServer
