Remove flag's aliases from the flags property

[PicchiKevin]

Fixes #102, short-flags in the cli.flags are a bit messy

[PicchiKevin]

This PR add cli.simpleFlags, the only difference with cli.flags is that it wont output flags aliases.

Example:

const cli = m({
	argv: ['-c', '-l'],
	flags: {
		coco: {
			alias: 'c'
		},
		loco: {
			alias: 'l'
		}
	}
});

console.log(cli.flags);
//=> { c: true, coco: true, l: true, loco: true }

console.log(cli.simpleFlags);
//=> { c: true, coco: true}

[sindresorhus]

I'm still not sold on this name. I think we should try to come up with something shorter.

[PicchiKevin]

I've got unsortedFlags, what do you thing about it 🤷‍♂️ ?

[sindresorhus]

Not really better. Let's just go with unnormalizedFlags for now.

[sindresorhus]

This also needs docs updates.

[PicchiKevin]

Made the changes requested but still can't choose a name.
I've got unsortedFlags 🤷‍♂️

Also updated in the doc, should I add more infos ?

[sindresorhus]

This looks good now. Thank you :)