update ci

Author: taowen

.travis.yml

@@ -1,6 +1,8 @@
 language: java
 sudo: false # faster builds
 
+install: true
+
 script: "mvn cobertura:cobertura"
 
 after_success:

README.md

@@ -1,5 +1,3 @@
-[![Sourcegraph](https://sourcegraph.com/github.com/json-iterator/java/-/badge.svg)](https://sourcegraph.com/github.com/json-iterator/java?badge)
-[![GoDoc](http://img.shields.io/badge/go-documentation-blue.svg?style=flat-square)](http://godoc.org/github.com/json-iterator/java)
 [![Build Status](https://travis-ci.org/json-iterator/java.svg?branch=master)](https://travis-ci.org/json-iterator/java)
 [![codecov](https://codecov.io/gh/json-iterator/java/branch/master/graph/badge.svg)](https://codecov.io/gh/json-iterator/java)
 [![rcard](https://goreportcard.com/badge/github.com/json-iterator/java)](https://goreportcard.com/report/github.com/json-iterator/java)