volt duplicates repository with different cases #277

$ volt get SirVer/UltiSnips
[INFO] Full building /home/user/.vim/pack/volt/opt directory ...
[INFO] Installing vimrc and gvimrc ...

• github.com/SirVer/UltiSnips > added repository to current profile
  $ volt get sirver/ultisnips
  [INFO] Full building /home/user/.vim/pack/volt/opt directory ...
  [INFO] Installing vimrc and gvimrc ...
• github.com/sirver/ultisnips > installed
  $ volt list | grep -i ultisnips
  github.com/SirVer/UltiSnips
  github.com/sirver/ultisnips

As you can see the plugin was fetched twice with different names.

It would be nice if volt could detect this and avoids such duplication.