added golangci-lint badge to repo

Author: barthr

README.tmpl.md

@@ -1,5 +1,6 @@
 # GolangCI-Lint
 [![Build Status](https://travis-ci.com/golangci/golangci-lint.svg?branch=master)](https://travis-ci.com/golangci/golangci-lint)
+[![GolangCI](https://golangci.com/badges/github.com/golangci/golangci-lint.svg)](https://golangci.com)
 
 GolangCI-Lint is a linters aggregator. It's fast: on average [5 times faster](#performance) than gometalinter.
 It's [easy to integrate and use](#command-line-options), has [nice output](#quick-start) and has a minimum number of false positives.