version bump and readme update for v0.13 release

Author: jeevatkm

README.md

@@ -1,8 +1,8 @@
-# resty  [![Build Status](https://travis-ci.org/go-resty/resty.svg?branch=master)](https://travis-ci.org/go-resty/resty) [![codecov](https://codecov.io/gh/go-resty/resty/branch/master/graph/badge.svg)](https://codecov.io/gh/go-resty/resty/branch/master)  [![GoReport](https://goreportcard.com/badge/go-resty/resty)](https://goreportcard.com/report/go-resty/resty)  [![Version](https://img.shields.io/badge/version-0.12-blue.svg)](https://github.com/go-resty/resty/releases/latest)  [![GoDoc](https://godoc.org/github.com/go-resty/resty?status.svg)](https://godoc.org/github.com/go-resty/resty) [![License](https://img.shields.io/github/license/go-resty/resty.svg)](LICENSE)
+# resty  [![Build Status](https://travis-ci.org/go-resty/resty.svg?branch=master)](https://travis-ci.org/go-resty/resty) [![codecov](https://codecov.io/gh/go-resty/resty/branch/master/graph/badge.svg)](https://codecov.io/gh/go-resty/resty/branch/master)  [![GoReport](https://goreportcard.com/badge/go-resty/resty)](https://goreportcard.com/report/go-resty/resty)  [![Version](https://img.shields.io/badge/version-0.13-blue.svg)](https://github.com/go-resty/resty/releases/latest)  [![GoDoc](https://godoc.org/github.com/go-resty/resty?status.svg)](https://godoc.org/github.com/go-resty/resty) [![License](https://img.shields.io/github/license/go-resty/resty.svg)](LICENSE)
 
 Simple HTTP and REST client for Go inspired by Ruby rest-client. [Features](#features) section describes in detail about resty capabilities.
 
-***v0.12 [released](https://github.com/go-resty/resty/releases/latest) and tagged on May 22, 2017.***
+***v0.13 [released](https://github.com/go-resty/resty/releases/latest) and tagged on Jun 22, 2017.***
 
 *Since Go v1.6 HTTP/2 & HTTP/1.1 protocol is used transparently. `Resty` works fine with HTTP/2 and HTTP/1.1.*
 

resty.go

@@ -6,4 +6,4 @@
 package resty
 
 // Version # of resty
-const Version = "0.12"
+const Version = "0.13"