show keys of lists in the prompt

Change-Id: I29deb2b3aa80734b675c0c8309f785fa2eed7ccc
diff --git a/src/main.cpp b/src/main.cpp
index c40f2ae..3a66ee4 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -62,7 +62,7 @@
     Parser parser(schema);
 
     while (true) {
-        std::cout << parser.currentNode() << ">";
+        std::cout << parser.currentNode() << "> ";
         std::string input;
         std::getline(std::cin, input);
         if (std::cin.eof())