Add historic contributors. (sofastack#37)

Add histoic contributors, should thank them for their contribution.

README.md

@@ -41,6 +41,10 @@ SOFARPC 是一个高可扩展性、高性能、生产级的 Java RPC 框架。
 
 [如何参与 SOFARPC 代码贡献](https://github.com/alipay/sofa-rpc/wiki/Contributing)
 
+## 致谢
+
+SOFARPC 最早源于阿里内部的 HSF，非常感谢毕玄创造了 HSF，使 SOFARPC 的发展有了良好的基础，也非常感谢寒泉子，独明，世范在 SOFARPC 发展过程中作出的贡献，😄。
+
 ## 开源许可
 
 SOFARPC 基于 [Apache License 2.0](https://github.com/alipay/sofa-rpc/blob/master/LICENSE) 协议，SOFARPC 依赖了一些三方组件，它们的开源协议参见[依赖组件版权说明](https://github.com/alipay/sofa-rpc/wiki/NOTICE)。

README_EN.md

@@ -4,6 +4,7 @@
 [![Coverage Status](https://codecov.io/gh/alipay/sofa-rpc/branch/master/graph/badge.svg)](https://codecov.io/gh/alipay/sofa-rpc)
 ![License](https://img.shields.io/badge/license-Apache--2.0-green.svg)
 [![Maven](https://img.shields.io/github/release/alipay/sofa-rpc.svg)](https://github.com/alipay/sofa-rpc/releases)
+
 ## Overview
 
 SOFARPC is a high-performance, high-extensibility, production-level Java RPC framework. In Ant Financial, SOFARPC has been used for more than ten years and developing for five generations. SOFARPC is dedicated to simplify RPC calls between applications, and provide convenient, no code intrusion, stable, and efficient point-to-point remote service invocation solutions for applications. For user and developer easy to improve features, SOFARPC provides a wealth of model abstraction and extensible interfaces, including filter, routing, load balancing, and so on. At the same time, it provides a rich MicroService governance solution around the SOFARPC framework and its surrounding components.