Fix to how metadata is sent in NLC Create Classifier method

Author: chughts

README.md

@@ -13,7 +13,9 @@ Node-RED Watson Nodes for IBM Cloud
     - Discovery node
     - Discovery Document Loader node
     - Discovery Query Builder node
-- List Expansion list, and List Training data modes added to Discovery node  
+    - Assistant V1 Workspace Manager node
+- List Expansion list, and List Training data modes added to Discovery node
+- Fix to Create Classifier mode in NLC node
 
 ### New in version 0.8.1
 - Node-RED & IBM-Watson & Use of promises on API invocation & IAM URL construct migration & Removal of default endpoint of

services/natural_language_classifier/v1.js

@@ -192,7 +192,8 @@ module.exports = function(RED) {
           language : config.language
         };
 
-        params.trainingMetadata = JSON.stringify(meta);
+        params.trainingMetadata = Buffer.from(JSON.stringify(meta));
+
         //params.trainingMetadata = meta;
 
         if ('string' === typeof msg.payload) {