Fix packagist package name in README.

[skip-ci]

README.md

@@ -4,8 +4,8 @@ HTTP Signature service and middleware (PHP)
 [![Build Status](https://travis-ci.org/legalthings/http-signature-php.svg?branch=master)](https://travis-ci.org/legalthings/http-signature-php)
 [![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/legalthings/http-signature-php/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/legalthings/http-signature-php/?branch=master)
 [![Code Coverage](https://scrutinizer-ci.com/g/legalthings/http-signature-php/badges/coverage.png?b=master)](https://scrutinizer-ci.com/g/legalthings/http-signature-php/?branch=master)
-[![Packagist Stable Version](https://img.shields.io/packagist/v/legalthings/http-signature-php.svg)](https://packagist.org/packages/legalthings/http-signature-php)
-[![Packagist License](https://img.shields.io/packagist/l/legalthings/http-signature-php.svg)](https://packagist.org/packages/legalthings/http-signature-php)
+[![Packagist Stable Version](https://img.shields.io/packagist/v/lto/http-signature-php.svg)](https://packagist.org/packages/lto/http-signature-php)
+[![Packagist License](https://img.shields.io/packagist/l/lto/http-signature-php.svg)](https://packagist.org/packages/lto/http-signature-php)
 
 This library provides a service for implementing the [IETF HTTP Signatures draft RFC](https://tools.ietf.org/html/draft-cavage-http-signatures).
 It includes PSR-7 compatible middleware for signing requests (by an HTTP client like Guzzle) and verifying http