Show a prompt character when asking a multiple choice question

Right now, when asking a multiple choice question such as which version to uninstall, there is no indication that a user input is expected:

Which version of vagrant would you like to uninstall?
 1) None [Default - Press Enter]
 2) 1.5.4
 3) 1.6.3
 4) 1.6.5
 5) All versions
1

Adding an input indicator such as the > character would make this clearer:

Which version of vagrant would you like to uninstall?
 1) None [Default - Press Enter]
 2) 1.5.4
 3) 1.6.3
 4) 1.6.5
 5) All versions
> 1

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