Includes trailing ) in markdown links

[idbrii]

Regression of #8

Every time I open a markdown link with <Plug>(openbrowser-smart-search) it includes the ) in the link. For example:

[tyru/open-browser-github.vim](https://github.com/tyru/open-browser-github.vim)

opens the link https://github.com/tyru/open-browser-github.vim) which is invalid.

---

It looks like g:openbrowser_iskeyword is no longer supported, so that method of fixing no longer works.

I tried using openbrowser_fix_paths, but it doesn't support wildcard so I don't think it's of any help:

let g:openbrowser_fix_paths = { "/google.*)" : "/tyru" }

[idbrii]

This is from my change b8d27c7. Apologies.

Only occurs when openbrowser_allowed_schemes is set:

let g:openbrowser_allowed_schemes = [
            \     'https\?',
            \     's\?ftp',
            \ ]