Readme needs required Chef version bumping to 16.0+

[KillerCars]

🗣️ Foreword

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👻 Brief Description

A clear and concise description of what the bug is.

README.md shows Chef 15.3+, but should be 16.0+

🥞 Cookbook version

Version of the cookbook where you are encountering the issue.

v10.0.0+

👩‍🍳 Chef-Infra Version

Version of chef-client in your environment.

15.14

🎩 Platform details

Operating system distribution and release version. Cloud provider if running in the cloud.

Steps To Reproduce

Steps to reproduce the behavior:

1. Go to 'README.md'
2. Scroll down to 'https://github.com/sous-chefs/postgresql#chef'
3. Look with your eyes
4. See error

🚓 Expected behavior

A clear and concise description of what you expected to happen.

Should read '16.0+'

➕ Additional context

Add any other context about the problem here. e.g. related issues or existing pull requests.