added parameter ask-passphrase to generate-cert command

[eschricker]

Added parameter ask-passphrase to generate-cert command additionally to passing the passphrase as parameter.

Description

Added parameter ask-passphrase to generate-cert command.

Checklist:

• [ ] I've added tests for my changes or tests are not applicable
• [x] I've changed documentations or changes are not required
• [x] I've added my changes to CHANGELOG.md

[mfn]

This is now part of 2.0.0-RC1. If you have time and can give it a spin before we push out 2.0.0, that would be great!