Bump app cast generator version

Author: Deadpikle

src/NetSparkle.Tools.AppCastGenerator/NetSparkle.Tools.AppCastGenerator.csproj

@@ -48,10 +48,10 @@
   </PropertyGroup>
   <PropertyGroup>
     <PostBuildEvent />
-    <AssemblyVersion>2.8.3.0</AssemblyVersion>
-    <FileVersion>2.8.3.0</FileVersion>
+    <AssemblyVersion>2.8.4.0</AssemblyVersion>
+    <FileVersion>2.8.4.0</FileVersion>
     <PackageId>NetSparkleUpdater.Tools.AppCastGenerator</PackageId>
-    <Version>2.8.3</Version>
+    <Version>2.8.4</Version>
     <Authors>Deadpikle</Authors>
     <PackageReadmeFile>README.md</PackageReadmeFile>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>