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README.md

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 [![Build Status](https://api.travis-ci.org/breard-r/acmed.svg?branch=master)](https://travis-ci.org/breard-r/acmed)
 [![Minimum rustc version](https://img.shields.io/badge/rustc-1.31.0+-lightgray.svg)](#build-from-source)
 [![LICENSE MIT](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE-MIT.txt)
-[![LICENSE Apache 2.0](https://img.shields.io/badge/license-Apache 2.0-blue.svg)](LICENSE-APACHE-2.0.txt)
+[![LICENSE Apache 2.0](https://img.shields.io/badge/license-Apache%202.0-blue.svg)](LICENSE-APACHE-2.0.txt)
 
 The Automatic Certificate Management Environment (ACME), is an internet standard ([RFC 8555](https://tools.ietf.org/html/rfc8555)) which allows to automate X.509 certificates signing by a Certification Authority (CA). ACMEd is one of the many clients for this protocol.