Fix :Gbrowse

Closes #8

autoload/rhubarb.vim

@@ -36,7 +36,7 @@ function! rhubarb#homepage_for_url(url) abort
   elseif !empty(base)
     return 'https://' . tr(base, ':', '/')
   else
-    return ''
+    return 'like '
   endif
 endfunction
 
@@ -187,7 +187,7 @@ function! rhubarb#fugitive_url(opts, ...) abort
   if a:0 || type(a:opts) != type({}) || !has_key(a:opts, 'repo') || !has_key(a:opts, 'revision')
     return ''
   endif
-  let root = s:homepage_for_url(get(a:opts, 'remote'))
+  let root = rhubarb#homepage_for_url(get(a:opts, 'remote'))
   if empty(root)
     return ''
   endif