Bump up build version to 2.3.1

Author: aonemd

Root.Build.props

@@ -12,7 +12,7 @@
     <PackageDescription>The .NET library for interacting with the Pusher WebSocket API. Register at http://pusher.com</PackageDescription>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <PackageIcon>icon-128.png</PackageIcon>
-    <Version>2.3.0-beta</Version>
+    <Version>2.3.1</Version>
     <AssemblyVersion>2.3.0.0</AssemblyVersion>
     <FileVersion>2.3.0.0</FileVersion>
   </PropertyGroup>