Merge branch '162-add-global-transaction-id' of github.com:watson-developer-cloud/dotnet-standard-sdk into 162-add-global-transaction-id

Author: mediumTaj

README.md

@@ -27,7 +27,7 @@ Ensure you have the following prerequisites:
 You can get the latest SDK packages through NuGet. Installation instructions can be found in the ReadMe of each package.
 
 * [Assistant V1](/src/IBM.WatsonDeveloperCloud.Assistant.v1)
-* [Assistant V2](/src/IBM.WatsonDeveloperCloud.Assistant.v2)
+* [Assistant V2](/src/IBM.WatsonDeveloperCloud.Assistant.v2) (private beta)
 * [Conversation](/src/IBM.WatsonDeveloperCloud.Conversation.v1) (deprecated - Use Assistant V1 or Assistant V2)
 * [Discovery](/src/IBM.WatsonDeveloperCloud.Discovery.v1)
 * [Language Translator V2](/src/IBM.WatsonDeveloperCloud.LanguageTranslator.v2) (deprecated - Use LanguageTranslator V3)

src/IBM.WatsonDeveloperCloud.Assistant.v2/README.md

@@ -2,6 +2,8 @@
 
 ### Assistant
 
+**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.**
+
 The IBM Watson™ [Assistant][assistant] service combines machine learning, natural language understanding, and integrated dialog tools to create conversation flows between your apps and your users.
 
 ### Installation

src/IBM.WatsonDeveloperCloud.TextToSpeech.v1/TextToSpeechService.cs

@@ -199,7 +199,7 @@ public Voices ListVoices(Dictionary<string, object> customData = null)
         /// that owns the custom model. Omit the parameter to use the specified voice with no customization.
         /// (optional)</param>
         /// <param name="customData">Custom data object to pass data including custom request headers.</param>
-        /// <returns><see cref="System.IO.FileStream" />System.IO.FileStream</returns>
+        /// <returns><see cref="System.IO.MemoryStream" />System.IO.MemoryStream</returns>
         public System.IO.MemoryStream Synthesize(Text text, string accept = null, string voice = null, string customizationId = null, Dictionary<string, object> customData = null)
         {
             if (text == null)

src/IBM.WatsonDeveloperCloud/Http/Request.cs

@@ -81,6 +81,10 @@ public IRequest WithBodyContent(HttpContent body)
 
         public IRequest WithHeader(string key, string value)
         {
+            if (key == "Accept" && value.StartsWith("audio/", StringComparison.OrdinalIgnoreCase))
+            {
+                this.Message.Headers.Accept.Clear();
+            }
             this.Message.Headers.TryAddWithoutValidation(key, value);
             return this;
         }