[REEF-1630] Update Snapshot Number to 04

JIRA:
  [REEF-1630](https://issues.apache.org/jira/browse/REEF-1630)

Pull request:
  This closes #1145
diff --git a/lang/cs/build.props b/lang/cs/build.props
index b30a864..9c02b87 100644
--- a/lang/cs/build.props
+++ b/lang/cs/build.props
@@ -59,7 +59,7 @@
   <!-- REEF NuGet properties -->
   <PropertyGroup>
     <IsSnapshot>true</IsSnapshot>
-    <SnapshotNumber>03</SnapshotNumber>
+    <SnapshotNumber>04</SnapshotNumber>
     <PushPackages>false</PushPackages>
     <NuGetRepository>https://www.nuget.org</NuGetRepository>
     <NuGetError>This project references NuGet package(s) that are missing on this computer. Enable NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</NuGetError>