Build: update gradle and kotlin versions.

app/build.gradle

@@ -13,7 +13,7 @@ apply plugin: 'kotlin-kapt'
 
 android {
     compileSdkVersion 27
-    buildToolsVersion '27.0.3'
+    buildToolsVersion '28.0.2'
 
     defaultConfig {
         applicationId "com.etesync.syncadapter"

build.gradle

@@ -8,14 +8,14 @@
 
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 buildscript {
-    ext.kotlin_version = '1.2.20'
+    ext.kotlin_version = '1.3.11'
 
     repositories {
         jcenter()
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.0.1'
+        classpath 'com.android.tools.build:gradle:3.2.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Fri Jan 19 13:40:32 GMT 2018
+#Sat Jan 05 13:36:12 GMT 2019
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.8-all.zip