feat: add statuscolumn

plugin/30_mini.lua

@@ -13,6 +13,9 @@ Config.now(function()
   -- Statusline.
   require('mini.statusline').setup()
 
+  -- Statuscolumn.
+  require('mini.statuscolumn').setup()
+
   -- Session management.
   require('mini.sessions').setup()
 end)