CLI target option set to `.` will cause an error

[antfu]

$ npx vue-i18n-locale-message squeeze --target=. --output=./translated.json
npx: installed 71 in 6.32s
Cannot read property 'split' of undefined

I suppose this is caused by this line: https://github.com/kazupon/vue-i18n-locale-message/blob/7f2e0af4dea7710788bb8bd81b573cb60c8bbccd/src/utils.ts#L42

While path.parse('.') returns { ..., dir: '' } which causes target become undefined

PS. using Windows here

[kazupon]

Thanks! feedback!