Update readme and remove comment code

Author: huyntsgs

README.md

@@ -54,20 +54,20 @@ In setup router part in main.go, I used gin and group common api url. Some apis
 The authorize uses crypto functions to encrypt/decrypt claim data as specified of JSON WEB TOKEN - JWT. The apis using authentication middleware are create, update and delete product.
 
 ````go
-v1 := router.Group("/api/v1")
-{
-// Get products with params limit offset likes /products?limit=50&lastId=0
-v1.GET("/products", productHandler.GetProducts())
-v1.GET("/products/:productId", productHandler.GetSingleProduct())
-}
-v1.POST("/users/register", userHandler.Register())
-v1.POST("/users/login", userHandler.Login())
-v1.Use(api.Authorize())
-{
-v1.POST("/products", productHandler.CreateProduct())
-v1.PUT("/products", productHandler.UpdateProduct())
-v1.DELETE("/products/:productId", productHandler.DeleteProduct())
-}
+v1 := router.Group("/api/v1")
+{
+// Get products with params limit offset likes /products?limit=50&lastId=0
+v1.GET("/products", productHandler.GetProducts())
+v1.GET("/products/:productId", productHandler.GetSingleProduct())
+}
+v1.POST("/users/register", userHandler.Register())
+v1.POST("/users/login", userHandler.Login())
+v1.Use(api.Authorize())
+{
+v1.POST("/products", productHandler.CreateProduct())
+v1.PUT("/products", productHandler.UpdateProduct())
+v1.DELETE("/products/:productId", productHandler.DeleteProduct())
+}
 ````
 
 We have totally seven apis.

store/mysql_products.go

@@ -9,15 +9,6 @@ import (
 // Using lastId will has better performance. lastId is retrieved from previous page query.
 func (mysql *MySqlDB) GetProducts(limit, offset int, lastId int64) ([]*models.Product, error) {
 
-// productsT := cache[lastId]
-// if productsT != nil && productsT.expire > time.Now().Unix() {
-//	return productsT.products, nil
-// }
-//db := GetDB()
-// if db == nil {
-//	return nil, errors.New("Can not connect to database")
-// }
-
 query, err := mysql.DB.Query("SELECT * FROM products where product_id > ? ORDER BY product_id ASC limit ?", lastId, limit)
 if err != nil {
 return nil, models.NewError("Internal server error", ERR_INTERNAL)