Use v:true and v:false instead of 1 and 0 for config.

This way, it's clearer that these options are not arbitrary integers.

doc/win.txt

@@ -75,9 +75,9 @@ The following variables can be used to customize the behavior of |vim-win|.
 *g:win_resize_width*                  `2`
   Number of columns to shift when
   resizing
-*g:win_disable_version_warning*       `0`
-  Set to 1 to disable the version
-  warning
+*g:win_disable_version_warning*       |v:false|
+  Set to |v:true| to disable the
+  version warning
 *g:win_ext_command_map*               `{}`
   A dictionary for extending
   |vim-win|

plugin/win.vim

@@ -22,7 +22,8 @@ endif
 
 let g:win_resize_height = get(g:, 'win_resize_height', 2)
 let g:win_resize_width = get(g:, 'win_resize_width', 2)
-let g:win_disable_version_warning = get(g:, 'win_disable_version_warning', 0)
+let g:win_disable_version_warning =
+      \ get(g:, 'win_disable_version_warning', v:false)
 " g:win_ext_command_map allows additional commands to be added to win.vim. It
 " maps command keys to command strings. These will override the built-in
 " vim-win commands that use the same keys, except for 1) <esc>, which is used