False positive check for presence of special flags

[felixSchl]

These checks are wrong:

neodoc/src/Docopt/Docopt.purs

Lines 138 to 139 in ce6a513

	output | canExit && output `has` opts.helpFlags -> ShowHelp help
	output | canExit && output `has` opts.versionFlags -> ShowVersion

They have to check not only for presence but also for non-false.