Android 工程统一版本

 ext.versions = [
        gradlePlugin      : '3.0.0',
        buildTools        : '26.0.2',

        minSdk            : 14,
        targetSdkVersion  : 26,
        compileSdk        : 26,

        publishVersion    : '1.0.1',
        publishVersionCode: 1,

        supportLib        : '26.0.2',
        constraint_layout : '1.1.0'
]