Update README.md

Author: Frederick-S

README.md

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-# cache-benchmark [![Build Status](https://travis-ci.org/read-and-code/cache-benchmark.svg?branch=master)](https://travis-ci.org/read-and-code/cache-benchmark) [![Build status](https://ci.appveyor.com/api/projects/status/xh2g8hyk9a4g5qdv/branch/master?svg=true)](https://ci.appveyor.com/project/Frederick-S/cache-benchmark/branch/master) [![Go Report Card](https://goreportcard.com/badge/github.com/read-and-code/cache-benchmark)](https://goreportcard.com/report/github.com/read-and-code/cache-benchmark) [![codebeat badge](https://codebeat.co/badges/1ed9cf43-acd7-44a4-ac0a-61d2460098f6)](https://codebeat.co/projects/github-com-read-and-code-cache-benchmark-master) [![Maintainability](https://api.codeclimate.com/v1/badges/362edfb49cc4761f63a0/maintainability)](https://codeclimate.com/github/read-and-code/cache-benchmark/maintainability)
+# cache-benchmark [![Build Status](https://travis-ci.org/read-and-code/cache-benchmark.svg?branch=master)](https://travis-ci.org/read-and-code/cache-benchmark) [![Build status](https://ci.appveyor.com/api/projects/status/xh2g8hyk9a4g5qdv/branch/master?svg=true)](https://ci.appveyor.com/project/Frederick-S/cache-benchmark/branch/master) [![Go Report Card](https://goreportcard.com/badge/github.com/read-and-code/cache-benchmark)](https://goreportcard.com/report/github.com/read-and-code/cache-benchmark) [![Maintainability](https://api.codeclimate.com/v1/badges/362edfb49cc4761f63a0/maintainability)](https://codeclimate.com/github/read-and-code/cache-benchmark/maintainability)
 《分布式缓存——原理、架构及Go语言实现》性能测试工具。