Minor adjustments to README.md

README.md

-[![Build Status](https://travis-ci.org/brpc/brpc.svg?branch=master)](https://travis-ci.org/brpc/brpc)
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 [中文版](README_cn.md)
 
+[![Build Status](https://travis-ci.org/brpc/brpc.svg?branch=master)](https://travis-ci.org/brpc/brpc)
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 # What is RPC?
 
 Most machines on internet communicate with each other via [TCP/IP](https://en.wikipedia.org/wiki/Internet_protocol_suite). However, TCP/IP only guarantees reliable data transmissions. We need to abstract more to build services:

README_cn.md

-[![Build Status](https://travis-ci.org/brpc/brpc.svg?branch=master)](https://travis-ci.org/brpc/brpc)
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 [English version](README.md)
 
 # 什么是RPC?