Update README.md

Author: a2

README.md

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 MessagePack.swift
 =================
 
-[![CI Status](https://img.shields.io/travis/a2/MessagePack.swift.svg?style=flat)](https://travis-ci.org/a2/MessagePack.swift)
 [![Version](https://img.shields.io/cocoapods/v/MessagePack.swift.svg?style=flat)](http://cocoapods.org/pods/MessagePack.swift)
 [![License](https://img.shields.io/cocoapods/l/MessagePack.swift.svg?style=flat)](http://cocoapods.org/pods/MessagePack.swift)
 [![Platform](https://img.shields.io/cocoapods/p/MessagePack.swift.svg?style=flat)](http://cocoapods.org/pods/MessagePack.swift)