build.gradle

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

buildscript {
    ext.kotlin_version = '1.3.21'
    repositories {
        google()
        jcenter()
        maven { url "https://oss.sonatype.org/content/repositories/snapshots/" }
        maven { url 'https://maven.fabric.io/public' }
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.2.0'
        classpath 'com.google.gms:google-services:4.2.0'
        classpath 'io.fabric.tools:gradle:1.28.1'

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

        classpath 'com.jakewharton:butterknife-gradle-plugin:9.0.0-SNAPSHOT'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

allprojects {
    repositories {
        google()
        jcenter()

        maven {
            url "https://maven.google.com"
        }
        ivy {
            url 'https://github.com/'
            layout 'pattern', {
                artifact '/[organisation]/[module]/archive/[revision].[ext]'
            }
        }
    }
}

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