Merge branch 'v4.0.0' into remove-compatibility-layer

Author: dpopp07

README.md

@@ -281,6 +281,7 @@ function (err, token) {
 ```
 
 ### Assistant v2
+> Watson Assistant v2 API is released in beta. For details, see the ["Introducing Watson Assistant"](https://www.ibm.com/blogs/watson/2018/03/the-future-of-watson-conversation-watson-assistant/) blog post.
 
 Use the [Assistant][assistant] service to determine the intent of a message.
 

auth.js.enc

@@ -49,8 +49,8 @@ describe('discovery_integration', function() {
       assert.ifError(err);
       assert(Array.isArray(res.environments));
       assert(res.environments.length);
-      assert(res.environments[0]);
-      assert.equal(res.environments[1].environment_id, environment_id);
+      const environment_ids = res.environments.map(e => e.environment_id);
+      assert(environment_ids.indexOf(environment_id) > -1);
       done();
     });
   });

test/integration/test.discovery.js

@@ -17,8 +17,8 @@ describe('language_translator_integration', function() {
   let language_translator;
 
   before(function() {
-    auth.language_translator.version = '2018-05-01';
-    language_translator = new watson.LanguageTranslatorV3(auth.language_translator);
+    auth.language_translator.v3.version = '2018-05-01';
+    language_translator = new watson.LanguageTranslatorV3(auth.language_translator.v3);
     nock.enableNetConnect();
   });