(fix) Enforce Node version for tsdx create, update documentation to express requirement.

[lpolito]

Fixes #432

There was a few ways I could have approached this, so let me know if there's something more ideal.

To test:

1. Build.
2. Change Node version to < 10 - nvm use 8.11.3
3. Run node /dist/index.js create foo, select any template – observe error

Unsupported Node version! Your current Node version (v8.11.3) does not satisfy the requirement of Node >=10.

4. Change Node version to >=10 - nvm use 10.17.0
5. Run node /dist/index.js create bar, select any template – observe success.

[lpolito]

Turns out there's a way to specify a version of node when running npx

So the command would be npx -p node@10 npx tsdx create {name}.
It's a little weird but it seems to work.

Maybe that should just go in the docs? The addition of engine in the template would still be valid, though.

[swyxio]

TIL about npx -p node@10... but how does that even work if you dont have that version installed!?

[lpolito]

TIL about npx -p node@10... but how does that even work if you dont have that version installed!?

Wasn't sure if this PR was waiting on the answer to this 😶

It works the same way as npx normally does (magic), except the package you're specifying is the particular node version. Then you just give it the command you want to run while running that node version. 🤷‍♂

[swyxio]

haha no i was just leaving room for the other maintainers to comment if needed. i'll go ahead n merge

[swyxio]

thanks for the great PR! @all-contributors please add @lpolito for code and docs

[allcontributors]

@sw-yx

I've put up a pull request to add @lpolito! 🎉