SuportLibrary conflict

I'm having a conflict in appcompat-v7: 27.1.1 although I can run the app more as a resolver? AS version 3.1.3

follow my build.gradle

apply plugin: 'com.android.application'

android {
compileSdkVersion 27
defaultConfig {
    applicationId "com.kbeanie.multipicker.sample"
    minSdkVersion 16
    targetSdkVersion 27
    versionCode 1
    versionName "1.0"
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}
buildToolsVersion '27.0.3'
productFlavors {
 }
}

dependencies {
implementation fileTree(include: ['*.jar'], dir: 'libs')
implementation 'com.android.support:appcompat-v7:27.1.1'
implementation 'com.android.support.constraint:constraint-layout:1.1.2'
implementation 'com.android.support:design:27.1.1'
implementation 'com.android.support:recyclerview-v7:27.1.1'
implementation 'com.google.android.gms:play-services-base:15.0.1'
implementation 'com.google.android.gms:play-services-ads:15.0.1'
implementation 'com.github.bumptech.glide:glide:3.7.0'
implementation 'net.yslibrary.keyboardvisibilityevent:keyboardvisibilityevent:1.0.1'
implementation 'com.kbeanie:multipicker:1.5@aar'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}

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