Add option to print the tag linenumber in the tagbar window (#684)

* Add option to print the tag linenumber in the tagbar window

* Update documentation markup

* Change variable name to g:tagbar_show_tag_linenumbers to be more consistent with other variables

* Fix documentation

plugin/tagbar.vim

@@ -96,13 +96,14 @@ function! s:setup_options() abort
         \ ['hide_nonpublic', 0],
         \ ['height', 10],
         \ ['indent', 2],
-        \ ['scopestrs', {}],
         \ ['left', 0],
         \ ['position', default_pos],
         \ ['previewwin_pos', previewwin_pos],
+        \ ['scopestrs', {}],
         \ ['show_balloon', 1],
         \ ['show_visibility', 1],
         \ ['show_linenumbers', 0],
+        \ ['show_tag_linenumbers', 0],
         \ ['singleclick', 0],
         \ ['sort', 1],
         \ ['systemenc', &encoding],