Update README.md with transpiled release info for PHP versions

[markunl]

Description

Updates README.md with transpiled release info guidance for users to match SDK releases to their version of PHP.

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes.

Previewed readme changes for formatting.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[RikudouSage]

Is that necessary? If you run it without any version, the biggest version available is installed - if you're on PHP 7.4, the version for 7.4 will be installed. Though it might be a problem if production uses different version than dev machine.

[markunl]

Is that necessary? If you run it without any version, the biggest version available is installed - if you're on PHP 7.4, the version for 7.4 will be installed. Though it might be a problem if production uses different version than dev machine.

Makes sense, we can drop this. Main motivation behind the update was a user asking for help and not being clear on which version of the SDK they should be using with their PHP version. But if this is handled automatically during install then I agree no update needed.