Get only LTS Node versions from node-versions manifest file (#53)

* Get only LTS Node versions from manifest

* Minor fix

get-new-tool-versions/parsers/verify-added-to-image/verify-common-tool-parser.psm1

@@ -9,7 +9,9 @@ function Search-ToolsVersionsNotOnImage {
     $stableReleases = (Invoke-RestMethod $ReleasesUrl) | Where-Object stable -eq $true
     $stableReleaseVersions = $stableReleases | ForEach-Object {
         if ($ToolName -eq "Node") {
+            if ($_.lts) {
               $_.$FilterParameter.split(".")[0] + ".0"
+            }
         } else {
             $_.$FilterParameter.split(".")[0,1] -join"."
         }