update version

Author: anusapan

src/IotHub/IotHub/Properties/AssemblyInfo.cs

@@ -32,5 +32,5 @@
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.3.1")]
-[assembly: AssemblyVersion("1.4.0")]
-[assembly: AssemblyFileVersion("1.4.0")]
+[assembly: AssemblyVersion("2.0.0")]
+[assembly: AssemblyFileVersion("2.0.0")]