update gradle files to the Android Studio 3 way

app/build.gradle

@@ -46,26 +46,13 @@ ext {
 }
 
 dependencies {
-    compile 'com.simplemobiletools:commons:2.39.10'
-    compile 'com.bignerdranch.android:recyclerview-multiselect:0.2'
-    compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
+    implementation 'com.simplemobiletools:commons:2.39.10'
+    implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
 
-    compile files('../libs/RootTools.jar')
+    implementation files('../libs/RootTools.jar')
 
-    debugCompile "com.squareup.leakcanary:leakcanary-android:$leakCanaryVersion"
-    releaseCompile "com.squareup.leakcanary:leakcanary-android-no-op:$leakCanaryVersion"
-}
-
-buildscript {
-    ext.kotlin_version = '1.1.60'
-    repositories {
-        mavenCentral()
-    }
-
-    dependencies {
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
-        classpath "org.jetbrains.kotlin:kotlin-android-extensions:$kotlin_version"
-    }
+    debugImplementation "com.squareup.leakcanary:leakcanary-android:$leakCanaryVersion"
+    releaseImplementation "com.squareup.leakcanary:leakcanary-android-no-op:$leakCanaryVersion"
 }
 
 def Properties props = new Properties()

build.gradle

@@ -1,11 +1,16 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
+    ext.kotlin_version = '1.1.60'
+
     repositories {
         jcenter()
+        google()
     }
+
     dependencies {
         classpath 'com.android.tools.build:gradle:3.0.0'
+        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
@@ -15,8 +20,8 @@ buildscript {
 allprojects {
     repositories {
         jcenter()
+        google()
         maven { url "https://jitpack.io" }
-        maven { url "https://maven.google.com" }
     }
 }