{
    "preferred-install": "dist",
    "require" : {
        "swiftmailer/swiftmailer": "v5.0.3",
        "michelf/php-markdown": "1.4.0",
        "guzzlehttp/guzzle": "4.2.4",
        "guzzlehttp/oauth-subscriber": "0.1.*"
    }
}

{
    "preferred-install": "dist",
    "require" : {
        "swiftmailer/swiftmailer": "v5.0.3",
        "michelf/php-markdown": "1.4.0",
        "guzzlehttp/guzzle": "^4.2.4",
        "guzzlehttp/oauth-subscriber": "0.1.*"
    }
}

Use ^4.2.4 for Guzzle constraint
Use ^4.2.4 for Guzzle constraint
