Drop question Will bump from X to Y. Continue?

[fregante]

Closes #376

[itaisteinherz]

I didn't notice it at first, but this introduced an issue where np always exits after ui.js finishes running because it doesn't return an answer for confirm:

np/source/cli.js

Line 94 in 9dac7aa

if (!options.confirm) {

The above always returns true because options.confirm isn't defined, which tells np to exit. I'm going to open a PR that fixes this in a bit.