Add support for Kotlin

[sicr0]

Required Info

• [x] I have searched the issues for my issue and found nothing related and/or helpful
• [x] I have read or at least glanced at the FAQ
• [x] I have read or at least glanced at the Wiki
• [x] VimDevIcons is the last loaded Vim plugin? Yes
• [x] What version of vim are you using? 8.2
• [x] What version of vim-devicons are you using? 0.11.0
• [x] Are you using Vim from the terminal or a GUI Vim? Terminal
• [x] Are you using Mac, Linux or Windows? Manjaro Linux

Optional Info

I use NERDTree with Vim DevIcons, for some reason .kt files aren't shown with the Kotlin icon. I also looked in the Nerd Fonts cheatsheet website and there is no Kotlin icon.

[get-me-power]

This can be achieved if the kotlin icon is added to nerdfont.

[toantk238]

As now, I think it has been supported. https://github.com/ryanoasis/nerd-fonts/issues/861

[ignamartinoli]

@toantk238 yea, I forgot that I opened that issue for this reason. Now we should be set