rocks :kvs.seq with padding

mix.exs

@@ -4,7 +4,7 @@ defmodule KVS.Mixfile do
   def project do
     [
       app: :kvs,
-      version: "8.11.2",
+      version: "8.12.0",
       description: "KVS Abstract Chain Database",
       package: package(),
       deps: deps()

src/stores/kvs_rocks.erl

@@ -140,7 +140,9 @@ add_table_index(_, _) -> ok.
 dump() -> ok.
 
 seq(_,_) ->
-  case os:type() of
+  Val =
+    case os:type() of
        {win32,nt} -> {Mega,Sec,Micro} = erlang:timestamp(), integer_to_list((Mega*1000000+Sec)*1000000+Micro);
                 _ -> erlang:integer_to_list(element(2,hd(lists:reverse(erlang:system_info(os_monotonic_time_source)))))
-  end.
+    end,
+  case 20 - length(Val) > 0 of true -> string:copies("0", 20 - length(Val)); _ -> "" end ++ Val.