Updating tool versions to latest and greatest

Kotlin: 1.3.71 -> 1.3.72
AGP: 3.6.2 -> 4.0.0
Gradle: 6.2.1 -> 6.5

build.gradle

@@ -5,15 +5,15 @@ buildscript {
       'minSdk': 14,
       'compileSdk': 29,
       'errorProne': '2.3.1',
-      'kotlin': '1.3.71',
+      'kotlin': '1.3.72',
   ]
   ext.deps = [
       assertj_core: 'org.assertj:assertj-core:3.9.1',
       // We don't need the latest version of AndroidX (there are no bugs that impact what LeakCanary
       // relies on), we're sticking a bit older because most apps will be using a more recent version
       // and they'll automatically resolve to higher version without having to necessarily resort to a
       // resolution strategy.
-      androidGradlePlugin: "com.android.tools.build:gradle:3.6.2",
+      androidGradlePlugin: "com.android.tools.build:gradle:4.0.0",
       androidx: [
           annotation: 'androidx.annotation:annotation:1.0.2',
           core: 'androidx.core:core:1.0.1',

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.2.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists