fix diff typescript

Author: Francesca-Bit

lib/woqlClient.js

@@ -1592,7 +1592,7 @@ WOQLClient.prototype.userOrganizations = function (orgList) {
  * //{ "@id" : "Person/Jane", "@type" : "Person", "name" : "Jannet"}
  */
 WOQLClient.prototype.patch = function (before, patch) {
-  if (typeof before !== 'object' || typeof after !== 'object') {
+  if (typeof before !== 'object' || typeof patch !== 'object') {
     const errmsg = '"before" or "after" parameter error - you must specify a valid before and after json document';
 
     return Promise.reject(