Mark detach option for 2.0 removal

atom/browser/api/atom_api_web_contents.cc

@@ -948,6 +948,8 @@ void WebContents::OpenDevTools(mate::Arguments* args) {
     mate::Dictionary options;
     if (args->GetNext(&options)) {
       options.Get("mode", &state);
+
+      // TODO(kevinsawicki) Remove in 2.0
       options.Get("detach", &detach);
       if (state.empty() && detach)
         state = "detach";