关于php：但是这些与您的要求或最低稳定性冲突

But these conflict with your requirements or minimum-stability

嗨，当我尝试安装SparkPost PHP库时遇到了这个问题：

Problem 1
- The requested package sparkpost/sparkpost No version set (parsed as 1.0.0) is satisfiable by sparkpost/sparkpost[No version set (parsed
as 1.0.0)] but these conflict with your requirements or
minimum-stability.

当我尝试执行此命令时出现：
composer require sparkpost/sparkpost

完整的控制台输出：

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You are running Composer with SSL/TLS protection disabled.
Using version ^2.0 for sparkpost/sparkpost
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

Problem 1
- The requested package sparkpost/sparkpost No version set (parsed as 1.0.0) is satisfiable by sparkpost/sparkpost[No version set (parsed as 1.0.0)] but these conflict with your requirements or minimum-stability.

Installation failed, reverting ./composer.json to its original content.

作曲者档案：

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{
"name":"sparkpost/sparkpost",
"description":"Client library for interfacing with the SparkPost API.",
"license":"Apache 2.0",
"authors": [
{
"name":"SparkPost"
}
],
"minimum-stability":"stable",
"scripts": {
"post-install-cmd":"post-install.sh",
"post-update-cmd":"post-install.sh",
"test":"./vendor/bin/phpunit",
"fix-style":"php-cs-fixer fix ."
},
"require": {
"php":"^5.6 || ^7.0",
"php-http/httplug":"^1.0",
"php-http/message":"^1.0",
"php-http/client-implementation":"^1.0",
"php-http/discovery":"^1.0",
"php-http/guzzle6-adapter":"^1.1",
"guzzlehttp/guzzle":"^6.2"
},
"require-dev": {
"phpunit/phpunit":"^4.8 || ^5.4",
"mockery/mockery":"^0.9.4",
"friendsofphp/php-cs-fixer":"^1.11",
"nyholm/nsa":"^1.0",
"satooshi/php-coveralls":"dev-master",
"phpunit/phpcov":"2.*"
},
"autoload": {
"psr-4": {
"SparkPost\\":"lib/SparkPost"
}
},
"autoload-dev": {
"psr-4": {
"SparkPost\\\\Test\\":"test/unit"
}
}
}

有什么办法吗？

PD：我尝试将"minimum-stability":"stable"设置为"dev"，但是我遇到了相同的错误