Non-Latin language support

[HyungJu]

Currently non-latin language (e.g. Korean(ko) ) is also implementing isVowel()method that only affects latin based languages.

• refactor generate method like sharadbhat/ReadableURL#6
• then implement non-latin language option without vowel glue or other english specific options
• custom rules for languages

I wrote this issue in english because I've mentioned the other PR that is in english, so that they could understand what I am doing!

[HyungJu]

@all-contributors please add @ddarkr for his code contribution

[allcontributors]

@HyungJu

I've put up a pull request to add @ddarkr! 🎉