but these conflict with your requirements or minimum-stability

by

Add minimum-stability and prefer-stable to your composer.json (not composer.lock):

{
    "name": "coderstephen/slack-client",
    "keywords": ["slack", "api", "realtime"],
    "license": "MIT",
    "description": "A better Slack client, with RTM API support",
    "authors": [{
        "name": "Stephen Coakley",
        "email": "[email protected]"
    }],
    "require": {
        "php": ">=5.5",
        "devristo/phpws": "dev-master",
        "evenement/evenement": "2.0.*",
        "guzzlehttp/guzzle": "~6.0",
        "react/event-loop": "^0.4.1",
        "react/promise": "^2.2"
    },
    "require-dev": {
        "phpunit/phpunit": "~4.6",
        "fzaninotto/faker": "~1.4",
        "apigen/apigen": "^4.1"
    },
    "autoload": {
        "psr-4": {
            "Slack\\": "src"
        }
    },
    "autoload-dev": {
        "psr-4": {
            "Slack\\Tests\\": "tests"
        }
    },
    "minimum-stability": "dev",
    "prefer-stable": true
}

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