message: Update contributor list date for v9.1.0
  [ci skip]
diff: ## GitHub Contributors
  Based on [GitHub](https://github.com/bkimminich/juice-shop) commits on
  -`master` as of Mon, 26 Aug 2019
  +`master` as of Mon, 14 Oct 2019
  - [Aashish Singh](https://github.com/Aashish683) aka `Aashish683`
  - [Arpit Agrawal](https://github.com/agrawalarpit14) aka
  