Update Directory.Build.props

Author: SimonCropp

src/Directory.Build.props

@@ -2,7 +2,7 @@
 <Project>
   <PropertyGroup>
     <NoWarn>CS1591;CS0649</NoWarn>
-    <Version>1.31.0</Version>
+    <Version>2.0.0</Version>
     <PackageTags>Json, Testing, Verify, Snapshot, Approvals</PackageTags>
     <Description>Enables simple verification of complex models and documents.</Description>
     <!-- below required for TargetLib and Shared -->