Bump version to 2.4.0

Author: MarkKoz

Directory.Build.props

@@ -15,7 +15,7 @@
         <Company>Source Engine Discord</Company>
         <Copyright>© 2014 EHVAG, 2020 Source Engine Discord and contributors</Copyright>
         <Product>SourceEngine.Demo</Product>
-        <Version>2.3.0</Version>
+        <Version>2.4.0</Version>
     </PropertyGroup>
 
     <PropertyGroup Label="Package Metadata">