Remove outdated info from README

README.md

@@ -1,10 +1,6 @@
 [![byte-stream](https://raw.githubusercontent.com/amphp/logo/master/repos/byte-stream.png?v=07-09-2017)](https://amphp.org/byte-stream/)
 
-<p align="center">
-<a href="https://travis-ci.org/amphp/byte-stream"><img src="https://img.shields.io/travis/amphp/byte-stream/master.svg?style=flat-square"></a>
-<a href="https://coveralls.io/github/amphp/byte-stream?branch=master"><img src="https://img.shields.io/coveralls/amphp/byte-stream/master.svg?style=flat-square"></a>
 <a href="blob/master/LICENSE"><img src="https://img.shields.io/badge/license-MIT-blue.svg?style=flat-square"></a>
-</p>
 
 `amphp/byte-stream` is a stream abstraction to make working with non-blocking I/O simple.
 
@@ -18,7 +14,7 @@ composer require amphp/byte-stream
 
 ## Requirements
 
-- PHP 7.0+
+- PHP 7.1+
 
 ## Documentation