fix: escape process.env.NODE_ENV in console warning to solve the error when using with vitejs (#144)

Author: dohaicuong

src/middlewares/error.js

@@ -85,7 +85,7 @@ function noticeAbsentStack() {
       schema: myGraphQLSchema,
       formatError: (error) => ({
         message: error.message,
-        stack: process.env.NODE_ENV === 'development' ? error.stack.split('\\n') : null,
+        stack: process.env\u200b.NODE_ENV === 'development' ? error.stack.split('\\n') : null,
       })
     });