added shellcheck for code actions

nvim/.config/nvim/lua/plugin/null-ls.lua

@@ -1,4 +1,4 @@
-return { 
+return {
     {
         "jose-elias-alvarez/null-ls.nvim",
         -- event = "BufReadPost",
@@ -10,10 +10,10 @@ return {
                         disabled_filetypes = { "lua" }
                     },
                     null_ls.builtins.diagnostics.shellcheck,
+                    null_ls.builtins.code_actions.shellcheck,
                 },
             }
         end,
-        
     },
 }