Gemfile.lock needs updating

[njc-paul]

The Gemfile.Lock seems to be using outdated gems

Gem Current Latest
mustermann 2.0.2 3.0.0
rack 2.2.8 3.0.8
rack-protection 2.2.4 3.1.0
sinatra 2.2.4 3.1.0
sinatra-contrib 2.2.4 3.1.0

[kinow]

Pull requests welcome! 🙂