message: Add vulnerabilities badge
diff: [![Codacy Badge](https://api.codacy.com/project/badge/Grade/bb15e2392a71473ea59d3f634f35c54e)](https://www.codacy.com/app/RocketChat/Rocket.Chat.ReactNative?utm_source=github.com&utm_medium=referral&utm_content=RocketChat/Rocket.Chat.ReactNative&utm_campaign=badger)
  [![codecov](https://codecov.io/gh/RocketChat/Rocket.Chat.ReactNative/branch/master/graph/badge.svg)](https://codecov.io/gh/RocketChat/Rocket.Chat.ReactNative)
  [![CodeFactor](https://www.codefactor.io/repository/github/rocketchat/rocket.chat.reactnative/badge)](https://www.codefactor.io/repository/github/rocketchat/rocket.chat.reactnative)
  +[![Known Vulnerabilities](https://snyk.io/test/github/rocketchat/rocket.chat.reactnative/badge.svg)](https://snyk.io/test/github/rocketchat/rocket.chat.reactnative)
  **Supported Server Versions:** 0.58.0+ (We are working to support earlier versions)
  