Change Suffix

Not thinking that ioutil already existed 🤦 changes suffix to be
`ext` so ioutil => ioext.

Author: Dean Karn

README.md

@@ -1,11 +1,11 @@
 # pkg
-![Project status](https://img.shields.io/badge/version-1.0.0-green.svg)
+![Project status](https://img.shields.io/badge/version-2.0.0-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)
 ![License](https://img.shields.io/dub/l/vibe-d.svg)
 
-pkg extends the core go packages with missing or additional functionality built in. All packages correspond to the std go package name with an additional suffix of `util` to avoid naming conflicts.
+pkg extends the core go packages with missing or additional functionality built in. All packages correspond to the std go package name with an additional suffix of `ext` to avoid naming conflicts.
 
 Motivation
 ----------

io/limit_reader.go

@@ -1,4 +1,4 @@
-package ioutil
+package ioext
 
 import (
 	"errors"

io/limit_reader_test.go

@@ -1,4 +1,4 @@
-package ioutil
+package ioext
 
 import (
 	"strings"