Make a command for fetching the current version of the CLI

[johnnyman727]

This is useful for debugging purposes.

The likely implementation will take the current t2-cli commit sha and either compare it to Github tags (where we save each version) or we'll save a copy of each version on our AWS server like we did with Tessel 1.

[wyze]

Couldn't this be as simple as just reading in the version field from package.json? I added the output really quick and could look something like this:

❯ t2 version
INFO Looking for your Tessel...
INFO Connected to t2-testing.
INFO Tessel [t2-testing] CLI version: 0.0.18
INFO Tessel [t2-testing] Firmware version: 0.0.12
INFO Tessel [t2-testing] Node version: 4.2.1

[johnnyman727]

@wyze It's been a while now but what I think I meant was that we want a way to compare the version of the CLI being used with the most recently published (which I referred to as "current") CLI. In any case, that was closed with #665 but outputting the CLI version in the t2 version command would definitely still be useful.

[wyze]

Alright, that makes sense. I will send a PR over adding CLI version to output of t2 version and it can be discussed there further if the team would like it to be added or not. Thanks for the clarification.

[johnnyman727]

👍