Update gradle.

build.gradle

@@ -8,7 +8,7 @@
 
 ext {
     kotlin_version = '1.3.30'
-    gradle_version = '3.2.1'
+    gradle_version = '3.4.0'
     compileSdkVersion = 28
     buildToolsVersion = '28.0.3'
 }
@@ -16,7 +16,7 @@ ext {
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 buildscript {
     ext.kotlin_version = '1.3.30'
-    ext.gradle_version = '3.2.1'
+    ext.gradle_version = '3.4.0'
 
     repositories {
         jcenter()

gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.8-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.1.1-all.zip