Ensure JSON file is sorted

[fregante]

The file isn't sorted. This check avoids problems in the future:

diff --git a/reserved-names.json b/reserved-names.json
index ad4afc8..e6745d8 100644
--- a/reserved-names.json
+++ b/reserved-names.json
@@ -88,11 +88,11 @@
   "contributing",
   "cookbook",
   "coupons",
-  "customer-stories",
   "customer",
+  "customer-stories",
   "customers",
-  "dashboard-feed",
   "dashboard",
+  "dashboard-feed",
   "dashboards",
   "design",
   "develop",