fix: Use Conversation for backward compatibility

Author: germanattanasio

lib/middleware/index.js

@@ -16,7 +16,7 @@
 
 var debug = require('debug')('watson-middleware:index');
 var Promise = require('bluebird');
-var AssistantV1 = require('watson-developer-cloud/assistant/v1');
+var ConversationV1 = require('watson-developer-cloud/conversation/v1');
 var watsonUtils = require('./utils');
 var deepMerge = require('deepmerge');
 
@@ -71,7 +71,7 @@ module.exports = function (config) {
 
       if (!middleware.conversation) {
         debug('Creating Conversation object with parameters: ' + JSON.stringify(config, null, 2));
-        middleware.conversation = new AssistantV1(config);
+        middleware.conversation = new ConversationV1(config);
       }
 
       if ((!message.text && message.type !== 'welcome') || ignoreType.indexOf(message.type) !== -1 || message.reply_to || message.bot_id) {
@@ -172,4 +172,4 @@ module.exports = function (config) {
 
   debug('Middleware: ' + JSON.stringify(middleware, null, 2));
   return middleware;
-};
+};