Show TSLint in "Linter/Formatter" when TypeScript selected

[tatchi]

My attempt to implement second point of #36.

As soon as "Linter/Formatter" feature is selected, all options are displayed (regardless of TypeScript selection). If TypeScript is selected but not the "Linter/Formatter", only TSLint option is proposed.

Hope that the logic is correct 😬

Don't hesitate if you see any improvement 😊

[lukeed]

Thanks @tatchi~!

I think that TSLint should only appear when Linter or Formatter feature is selected, so the logic is doing more than it should IMO.

I'll make that change for you once I get TS in completely 👍 Holding off on merging this until then.

🙇

[tatchi]

Thanks @lukeed :)

I still changed the logic: now it displays the options only when Linter or Formatter feature is selected. If TypeScript is selected then it shows TSLint, otherwise ESLint

Feel free to change if it's still not aligned with your expectation :)