Fix badges

README.md

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-Gogs - Go Git Service [![wercker status](https://app.wercker.com/status/ad0bdb0bc450ac6f09bc56b9640a50aa/s/ "wercker status")](https://app.wercker.com/project/bykey/ad0bdb0bc450ac6f09bc56b9640a50aa) [![Build Status](https://drone.io/github.com/gogits/gogs/status.png)](https://drone.io/github.com/gogits/gogs/latest) 
+Gogs - Go Git Service [![wercker status](https://app.wercker.com/status/ad0bdb0bc450ac6f09bc56b9640a50aa/s/ "wercker status")](https://app.wercker.com/project/bykey/ad0bdb0bc450ac6f09bc56b9640a50aa) [![Build Status](https://travis-ci.org/gogits/gogs.svg?branch=master)](https://travis-ci.org/gogits/gogs)
 =====================
 
 Gogs(Go Git Service) is a painless self-hosted Git Service written in Go.

README_ZH.md

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-Gogs - Go Git Service [![wercker status](https://app.wercker.com/status/ad0bdb0bc450ac6f09bc56b9640a50aa/s/ "wercker status")](https://app.wercker.com/project/bykey/ad0bdb0bc450ac6f09bc56b9640a50aa) [![Build Status](https://drone.io/github.com/gogits/gogs/status.png)](https://drone.io/github.com/gogits/gogs/latest)
+Gogs - Go Git Service [![wercker status](https://app.wercker.com/status/ad0bdb0bc450ac6f09bc56b9640a50aa/s/ "wercker status")](https://app.wercker.com/project/bykey/ad0bdb0bc450ac6f09bc56b9640a50aa) [![Build Status](https://travis-ci.org/gogits/gogs.svg?branch=master)](https://travis-ci.org/gogits/gogs)
 =====================
 
 Gogs(Go Git Service) 是一个基于 Go 语言的自助 Git 服务。