Update Gradle plugin to 3.0

build.gradle

@@ -3,6 +3,7 @@ buildscript {
     repositories {
         jcenter()
         mavenCentral()
+        google()
     }
     dependencies {
         classpath "com.android.tools.build:gradle:${project.gradleVersion}"
@@ -17,5 +18,6 @@ allprojects {
         jcenter()
         maven { url "https://jitpack.io" }
         maven { url "https://maven.google.com" }
+        google()
     }
 }