implementation 'com.android.support:appcompat-v7:27.1.0'
 implementation 'com.android.support:design:27.1.0'
    implementation 'com.android.support:support-v4:27.1.0'
 implementation 'com.android.support:recyclerview-v7:27.1.0'

像上面一样将所有支持库更新到 27.1.0 并删除重复项

update your all support library to 27.1.0 like above and remove duplicates