Update README.md

Author: Dean Karn

README.md

@@ -1,5 +1,5 @@
 # pkg
-![Project status](https://img.shields.io/badge/version-3.1.3-green.svg)
+![Project status](https://img.shields.io/badge/version-3.1.4-green.svg)
 [![Build Status](https://travis-ci.org/go-playground/pkg.svg?branch=master)](https://travis-ci.org/go-playground/pkg)
 [![Coverage Status](https://coveralls.io/repos/github/go-playground/pkg/badge.svg?branch=master)](https://coveralls.io/github/go-playground/pkg?branch=master)
 [![GoDoc](https://godoc.org/github.com/go-playground/pkg?status.svg)](https://godoc.org/github.com/go-playground/pkg)