docs: Update the document link in the README file

Author: kuafuRace

README.cn.md

@@ -82,7 +82,7 @@ carbon.Parse("2020-07-05 13:14:15").SetLocale("zh-CN").DiffForHumans() // 1 月
 carbon.ClearTestNow()
 carbon.IsTestNow() // false
 ```
-更多示例请查看 [carbon.go-pkg.com](https://carbon.go-pkg.com).
+更多示例请查看 <a href="https://carbon.go-pkg.com" target="_blank">carbon.go-pkg.com</a>
 
 ## 参考项目
 

README.jp.md

@@ -75,7 +75,7 @@ carbon.Parse("2020-07-05 13:14:15").SetLocale("jp").DiffForHumans() // 1 ヶ月
 carbon.ClearTestNow()
 carbon.IsTestNow() // false
 ```
-詳細については [carbon.go-pkg.com](https://carbon.go-pkg.com/jp)
+詳細については <a href="https://carbon.go-pkg.com" target="_blank">carbon.go-pkg.com</a>
 
 ## リファレンス
 

README.md

@@ -79,7 +79,7 @@ carbon.ClearTestNow()
 carbon.IsTestNow() // false
 ```
 
-There are many more examples in the [documentation](https://carbon.go-pkg.com).
+There are many more examples in the <a href="https://carbon.go-pkg.com" target="_blank">documentation</a>
 
 ## References