CLIInfo version might need to be optional

[cmcgee1024]

It might be worth considering making the CLIInfo.version optional instead of required in the specification. Tools are often bundled and installed as packages with other software, so the version is really with the package. Also, in some environments a software package doesn't know its own version at packaging time because the same bits can be both the final release candidate and the final release version after extensive testing without any gating issues. Making it required might force people into giving their tools nonsensical version number in these cases that can lead to problems further down the line.

[patriksvensson]

I'm open to making CLIInfo version optional, but it should be encouraged whenever possible.