whitespace-after-token should have it's type set to boolean

whitespace-after-token defaults to true if nothing is passed but if you end up passing in a value for it, it is converted to a string by default.

This causes:

project.options.requireWhitespaceAfterToken = !!argv['whitespace-after-token']

to always be true. Setting the type ensures whitespace-after-token is always a boolean and project.options.requireWhitespaceAfterToken to be evaluated correctly.