{
    "name": "burgov/key-value-form-bundle",
    "license": "MIT",
    "type": "bundle",
    "description": "A form type for managing key-value pairs",
    "autoload": {
        "psr-4": { "Burgov\\Bundle\\KeyValueFormBundle\\": "" }
    },
    "require": {
        "php": ">=5.3.3",
        "symfony/form": "~2.3|3.*"
    },
    "extra": {
        "branch-alias": {
            "dev-master": "1.1-dev"
        }
    }

}

{
    "name": "burgov/key-value-form-bundle",
    "license": "MIT",
    "type": "bundle",
    "description": "A form type for managing key-value pairs",
    "autoload": {
        "psr-4": { "Burgov\\Bundle\\KeyValueFormBundle\\": "" }
    },
    "require": {
        "php": ">=5.3.3",
        "symfony/form": "~2.3|3.*"
    },
    "conflict": {
        "symfony/form": "2.8.1"
    },
    "extra": {
        "branch-alias": {
            "dev-master": "1.1-dev"
        }
    }

}

Make it impossible to install the bundle with symfony 2.8.1
Make it impossible to install the bundle with symfony 2.8.1