add modules section to app.src

when i was trying generate release by relx, i have got message "Errors generating release. erlang_localtime: Missing parameter in .app file: applications"

src/erlang_localtime.app.src

@@ -1,6 +1,7 @@
 {application, 'erlang_localtime',
  [
   {description, ""},
+  {applications, [kernel, stdlib]},
   {vsn, "1.0"},
   {registered, []},
   {env, []}