Set version to 4.0

Author: Numpsy

src/Serilog.Enrichers.Thread/Serilog.Enrichers.Thread.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <Description>Enrich Serilog events with properties from the current thread.</Description>
-    <VersionPrefix>3.2.0</VersionPrefix>
+    <VersionPrefix>4.0.0</VersionPrefix>
     <Authors>Serilog Contributors</Authors>
     <!-- .NET Framework version targeting is frozen at these two TFMs. -->
     <TargetFrameworks Condition=" '$(OS)' == 'Windows_NT'">net471;net462</TargetFrameworks>