Makefile: collect coverage report for codecov.io

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diff --git a/README.md b/README.md
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 # syzkaller - kernel fuzzer
 
-[![Build Status](https://travis-ci.org/google/syzkaller.svg?branch=master)](https://travis-ci.org/google/syzkaller) [![Go Report Card](https://goreportcard.com/badge/github.com/google/syzkaller)](https://goreportcard.com/report/github.com/google/syzkaller) [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](LICENSE)
+[![Build Status](https://travis-ci.org/google/syzkaller.svg?branch=master)](https://travis-ci.org/google/syzkaller)
+[![Go Report Card](https://goreportcard.com/badge/github.com/google/syzkaller)](https://goreportcard.com/report/github.com/google/syzkaller)
+[![Coverage Status](https://codecov.io/gh/google/syzkaller/graph/badge.svg)](https://codecov.io/gh/google/syzkaller)
+[![GoDoc](https://godoc.org/github.com/google/syzkaller?status.svg)](https://godoc.org/github.com/google/syzkaller)
+[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](LICENSE)
 
 `syzkaller` is an unsupervised coverage-guided kernel fuzzer. `Linux` kernel fuzzing has the most support, `akaros`, `freebsd`, `fuchsia`, `netbsd`, `windows` and `gvisor` are supported to varying degrees.