Replace recommended guzzlehttp/psr7 with php-http/guzzle6-adapter

The guzzlehttp/psr7 package is providing all PSR-17 factories but only starting from version 2.0.x-dev which is currently in development (the change is already in master), thus Packagist is correctly showing this package as a provider for the psr/http-factory-implementation virtual package.

CHANGELOG.md

@@ -4,6 +4,9 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+### Fixed
+- Replace recommended guzzlehttp/psr7 with php-http/guzzle6-adapter
+
 ## [1.5.1] - 2020-06-06
 ### Fixed
 - Fix excluded exceptions option. Since we're not using ClientInterface::captureException to capture exceptions,

README.md

@@ -23,7 +23,7 @@ whichever PSR-7 implementation and HTTP client they want to use.
 If you just want to get started quickly you should run the following command:
 
 ```bash
-composer require wieni/wmsentry php-http/curl-client guzzlehttp/psr7
+composer require wieni/wmsentry php-http/curl-client php-http/guzzle6-adapter
 ```
 For more information, please refer to the _Install_ section of the [`sentry/sentry-php`](https://github.com/getsentry/sentry-php#install) repository README.