Update gradle.

app/build.gradle

@@ -134,7 +134,8 @@ dependencies {
     compile group: 'com.google.code.gson', name: 'gson', version: '1.7.2'
     compile 'com.squareup.okhttp3:logging-interceptor:3.8.0'
     compile 'org.apache.commons:commons-collections4:4.1'
-    provided 'org.projectlombok:lombok:1.16.16'
+    compileOnly 'org.projectlombok:lombok:1.16.20'
+    annotationProcessor 'org.projectlombok:lombok:1.16.20'
     compile 'net.cachapa.expandablelayout:expandablelayout:2.9.2'
 
     // for tests

build.gradle

@@ -12,7 +12,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.3.1'
+        classpath 'com.android.tools.build:gradle:3.0.0'
     }
 }
 

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Tue Aug 23 16:42:17 CEST 2016
+#Fri Jan 19 13:40:32 GMT 2018
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-3.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip