migrate to node10

https://github.com/microsoft/azure-pipelines-tasks/blob/master/docs/migrateNode10.md

dist/azure/gitreleasemanager/open/task.json

@@ -14,7 +14,7 @@
     },
     "minimumAgentVersion": "2.115.0",
     "execution": {
-        "Node": {
+        "Node10": {
             "target": "bundle.js",
             "argumentFormat": "",
             "workingDirectory": "."
@@ -57,4 +57,4 @@
         "required": false,
         "helpMarkDown": "The directory on which GitReleaseManager should be executed. Defaults to current directory"
     }]
-}
+}