== deploy 1: user limit 10, config-version 1. alice makes 3 requests.
stored capacity in Redis: 10
== deploy 2: user limit raised to 20 in application.yml, config-version still 1
X-RateLimit-Limit header says 20
stored capacity in Redis:   10
X-RateLimit-Remaining:      6
== deploy 3: limit 20 and config-version 2
X-RateLimit-Limit header says 20
stored capacity in Redis:   20
X-RateLimit-Remaining:      11