set version to 4.0, as it increments from PocketSharp.Reader 3.0

ReadSharp.Tests/Properties/AssemblyInfo.cs

@@ -1,5 +1,4 @@
 using System.Reflection;
-using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 
 // General Information about an assembly is controlled through the following 

ReadSharp/Properties/AssemblyInfo.cs

@@ -22,5 +22,5 @@
 // You can specify all the values or you can default the Build and Revision Numbers
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.0.0")]
-[assembly: AssemblyFileVersion("1.0.0")]
+[assembly: AssemblyVersion("4.0.0")]
+[assembly: AssemblyFileVersion("4.0.0")]

ReadSharp/Reader.cs

@@ -59,7 +59,7 @@ namespace ReadSharp
       _httpClient.DefaultRequestHeaders.TryAddWithoutValidation("Accept-Encoding", "gzip,deflate");
 
       // add user agent
-      _httpClient.DefaultRequestHeaders.TryAddWithoutValidation("User-Agent", string.Format(_userAgent, "; ReadSharp/3.0"));
+      _httpClient.DefaultRequestHeaders.TryAddWithoutValidation("User-Agent", string.Format(_userAgent, "; ReadSharp/4.0"));
     }