rename LICENSE to COPYING and update swift version

.travis.yml

@@ -2,7 +2,7 @@ language: generic
 sudo: required
 dist: trusty
 env:
-- SWIFT_BRANCH=swift-4.0-branch SWIFT_VERSION=swift-4.0-DEVELOPMENT-SNAPSHOT-2017-06-06-a
+- SWIFT_BRANCH=swift-4.0-branch SWIFT_VERSION=swift-4.0-DEVELOPMENT-SNAPSHOT-2017-06-23-a
 install:
 - mkdir swift
 - curl https://swift.org/builds/$SWIFT_BRANCH/ubuntu1404/$SWIFT_VERSION/$SWIFT_VERSION-ubuntu14.04.tar.gz -s | tar xz -C swift &> /dev/null

README.md

@@ -1,11 +1,11 @@
 # maxpng
 
-[![Platforms](https://img.shields.io/badge/platform-linux-lightgrey.svg)](https://developer.apple.com/swift/)
+[![Platforms](https://img.shields.io/badge/platform-linux-lightgrey.svg)](https://swift.org)
 [![Release tag](https://img.shields.io/github/release/kelvin13/maxpng.svg)](https://github.com/kelvin13/maxpng/releases)
 [![Build](https://travis-ci.org/kelvin13/maxpng.svg?branch=master)](https://travis-ci.org/kelvin13/maxpng)
 [![Issues](https://img.shields.io/github/issues/kelvin13/maxpng.svg)](https://github.com/kelvin13/maxpng/issues?state=open)
 [![Language](https://img.shields.io/badge/version-swift_4-ffa020.svg)](https://swift.org)
-[![License](https://img.shields.io/badge/license-GPL3-ff3079.svg)](https://github.com/kelvin13/maxpng/blob/master/LICENSE.gpl3)
+[![License](https://img.shields.io/badge/license-GPL3-ff3079.svg)](https://github.com/kelvin13/maxpng/blob/master/COPYING)
 [![Queen](https://img.shields.io/badge/taylor-swift-e030ff.svg)](https://www.google.com/search?q=where+is+ts6&oq=where+is+ts6)
 
 <img align="right" src="max.png">