Issue with error message with no matching callback

[AckslD]

Describe the bug
Before I had properly configured my company's gitlab ie:

callbacks = {
  ["git.seriouscompany.com"] = require"gitlinker.hosts".get_gitlab_type_url
}

when gitlinker hit this line to print the error message it failed and said that target_host wasn't a string but a number.

E5108: Error executing lua ...pack/packer/start/gitlinker.nvim/lua/gitlinker/hosts.lua:116: bad argument #2 to 'error' (number expected, got string)

To Reproduce
See above.

Expected behavior
Getting the error "No host callback defined for host 'git.seriouscompany.com'"

System (please complete the following information):

• OS: archlinux
• neovim --version v0.5.0-dev+1419-gf76f72a27
• git --version 2.32.0

[ruifm]

Thanks for the report! I think I fixed with #17, feel free to reopen, if it's still not fixed for you.