build.gradle

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    ext.kotlin_version = '1.2.21'
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.1'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

ext {
    // App dependencies
    supportLibraryVersion = '26.1.0'
    loggingInterceptorVersion = '3.8.0'
    okhttpVersion = '3.9.0'
    rxJava2AndroidVersion = '2.0.1'
    retrofitVersion = '2.3.0'
    butterKnifeVersion = '8.5.1'
}