Fix README for godbolt link

Close #441

Author: ChuanqiXu9

README.md

@@ -18,7 +18,7 @@ and the traditional Future/Promise.
 
 # Quick Experience
 
-We can try async_simple online in [compiler-explorer](compiler-explorer.com): https://compiler-explorer.com/z/Tdaesqsqj . Note that `Uthread` cannot be use in compiler-explorer since it requires installation.
+We can try async_simple online in [compiler-explorer](https://compiler-explorer.com/z/Tdaesqsqj). Note that `Uthread` cannot be use in compiler-explorer since it requires installation.
 
 # Get Started
 

README_CN.md

@@ -15,7 +15,7 @@ async\_simple是阿里巴巴开源的轻量级C++异步框架。提供了基于C
 
 # 快速体验
 
-我们可以在 [compiler-explorer](compiler-explorer.com) 中在线快速体验 async_simple: https://compiler-explorer.com/z/Tdaesqsqj . 注意 `Uthread` 在 compiler-explorer 中不能使用。
+我们可以在 [compiler-explorer](https://compiler-explorer.com/z/Tdaesqsqj) 中在线快速体验 async_simple. 注意 `Uthread` 在 compiler-explorer 中不能使用。
 
 # 快速入门