increment version to v2.2.0

Author: Dean Karn

README.md

@@ -1,7 +1,7 @@
 Package form
 ============
 <img align="right" src="https://raw.githubusercontent.com/go-playground/form/master/logo.jpg">
-![Project status](https://img.shields.io/badge/version-2.1.0-green.svg)
+![Project status](https://img.shields.io/badge/version-2.2.0-green.svg)
 [![Build Status](https://semaphoreci.com/api/v1/joeybloggs/form/branches/master/badge.svg)](https://semaphoreci.com/joeybloggs/form)
 [![Coverage Status](https://coveralls.io/repos/github/go-playground/form/badge.svg?branch=master)](https://coveralls.io/github/go-playground/form?branch=master)
 [![Go Report Card](https://goreportcard.com/badge/github.com/go-playground/form)](https://goreportcard.com/report/github.com/go-playground/form)