node: add missing Isolate::Scope at startup

Reviewed-by: Trevor Norris <[email protected]>
diff --git a/src/node.cc b/src/node.cc
index d4247d0..fe97888 100644
--- a/src/node.cc
+++ b/src/node.cc
@@ -3617,6 +3617,7 @@
   V8::Initialize();
   {
     Locker locker(node_isolate);
+    Isolate::Scope isolate_scope(node_isolate);
     HandleScope handle_scope(node_isolate);
     Local<Context> context = Context::New(node_isolate);
     Environment* env = CreateEnvironment(