Added version and fixed BatchRequest error

lib/zimbra-admin-api.js

@@ -118,6 +118,11 @@ return /******/ (function(modules) { // webpackBootstrap
 	  }
 	
 	  (0, _createClass3.default)(ZimbraAdminApi, [{
+	    key: 'version',
+	    value: function version() {
+	      return ZimbraAdminApi.version();
+	    }
+	  }, {
 	    key: 'buildRequestData',
 	    value: function buildRequestData(request_name, callback) {
 	      var request_data = {};

src/index.js

@@ -21,6 +21,10 @@ export default class ZimbraAdminApi {
     return pjson.version;
   }
 
+  version() {
+    return ZimbraAdminApi.version();
+  }
+
   buildRequestData (request_name, callback) {
     const request_data = { };
     // TODO: Eliminar dependencia de client que se pasa a todos lados