Hasura CLI installation instruction show different methods and each method installs different version

### Version Information

Server Version: N/A
CLI Version (for CLI related issue): ~ 2.2.0

### Environment

macOS

### What is the current behaviour?

I installed Hasura CLI through Homebrew and, I wanted/needed to downgrade to previous version so I uninstalled it and installed it vai `curl | bash` method and then again via `npm i --global`. All three of these methods installed three different versions of the CLI tool.

Homebrew installs 2.2.0
NPM installs 2.7.1
curl | bash install 2.8.3

That's quite a difference.

### What is the expected behaviour?

Latest version of Hasura CLI tool is published and available through all platforms mentioned in installation docs.

### If the bug is confirmed, would you be willing to submit a PR?

No.