Introduced new generalized JSON-format for `top10`

[demos/kafka/wordcount] / popular

diff --git a/popular b/popular
index 8af553a..73eec81 160000 (submodule)
--- a/popular
+++ b/popular
@@ -1 +1 @@
-Subproject commit 8af553a2b1cae0b7f5c9d9c63023b47af89bd5ab
+Subproject commit 73eec81b106ad2a145565c8e87bd6fe2a32b617e