Upgrade gradle.

build.gradle

@@ -8,15 +8,15 @@
 
 ext {
     kotlin_version = '1.3.30'
-    gradle_version = '3.5.2'
+    gradle_version = '4.0.0'
     compileSdkVersion = 28
-    buildToolsVersion = '28.0.3'
+    buildToolsVersion = '29.0.3'
 }
 
 // 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 = '3.5.2'
+    ext.gradle_version = '4.0.0'
 
     repositories {
         jcenter()

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Wed Nov 06 20:03:49 IST 2019
+#Wed Aug 19 17:33:20 IDT 2020
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.1.1-all.zip