Add skipQuestions flag

[rafaelalmeidatk]

With the flag enabled, the prompt asking for the type of changes won't show up. The generated changelog will look like this (no headings):

- Change 1: #321
- Change 2: #322
- Change 3: #323

To avoid creating a new file just for this flag, I utilized the hook.js file with a named export to avoid breaking changes

[rafaelalmeidatk]

Uh I think I could add it as a CLI flag, it would be cleaner 🤔

[timneutkens]

Uh I think I could add it as a CLI flag, it would be cleaner 🤔

Yeah let's do a CLI flag!