enable single quotes for lua code

lua/plugins/lspconfig.lua

@@ -251,6 +251,14 @@ return {
           telemetry = {
             enable = false,
           },
+          format = {
+            enable = true,
+            defaultConfig = {
+              indent_style = 'space',
+              indent_size = '2',
+              quote_style = 'single'
+            }
+          }
         },
       }
     }