askForVersion function
Ask the user to select the new version no.
Pass in the current currentVersion
number.
Implementation
sm.Version askForVersion(Version currentVersion) {
final options = determineVersionToOffer(currentVersion);
print('');
print(blue('What sort of changes have been made since the last release?'));
final selected = menu('Select the change level:', options: options)
..requestVersion();
return confirmVersion(selected.version);
}