Update build script

build.ps1

@@ -1,25 +1,35 @@
 param([String]$key,[String]$version)
 
 function setProjectVersion([String]$project, [String]$version) {
-	$fileName =  ".\src\$project\project.json"
-    $content = (Get-Content $fileName) -join "`n" | ConvertFrom-Json
-    $content.version = $version
-    $newContent = ConvertTo-Json -Depth 10 $content
-    Set-Content $fileName $newContent
+	$fileName =  resolve-path  ".\src\$project\$project.csproj"
+    $content = [xml](Get-Content $fileName)
+	$v = $content.CreateElement("Version")
+	$v.set_InnerXML($version)
+    $content.Project.PropertyGroup.AppendChild($v)
+    $content.Save($fileName)
 }
 
 function publishProject([String]$project,[String]$version) {
 	cd ".\src\$project"
 	& dotnet pack -c Release
+	if ($LastExitCode -ne 0) {
+		throw "Error ($LastExitCode) during dotnet pack"
+	}
 	$file = Get-Item "bin\Release\*.$version.nupkg"
 	nuget push $file.FullName $key -Source https://api.nuget.org/v3/index.json
+	if ($LastExitCode -ne 0) {
+		throw "Error ($LastExitCode) during nuget push"
+	}
 	cd ..\..
 }
 
 if ($version -ne "") {
 	setProjectVersion "Folke.Core" $version
 
 	& dotnet restore
+	if ($LastExitCode -ne 0) {
+		throw "Error ($LastExitCode) during dotnet restore"
+	}
 
 	publishProject "Folke.Core" $version
 }