#3816 Update Android Gradle Plugin to 4.0.0 (#3817)

* #3816 Update Android Gradle Plugin to 4.0.0 - upgrade AGP - remove explicit buildToolsVersion

* #3816 Update Android Gradle Plugin to 4.0.0 - remove extraneous multiDexEnabled

* #3816 Update Android Gradle Plugin to 4.0.0 - update Travis to use bundled build tools

.travis.yml

@@ -15,7 +15,7 @@ android:
   components:
   - tools
   - platform-tools
-  - build-tools-28.0.3
+  - build-tools-29.0.2
   - extra-google-m2repository
   - extra-android-m2repository
   - android-22

app/build.gradle

@@ -134,7 +134,6 @@ dependencies {
 
 android {
     compileSdkVersion 28
-    buildToolsVersion "28.0.3"
 
     defaultConfig {
         //applicationId 'fr.free.nrw.commons'
@@ -152,7 +151,6 @@ android {
         testOptions {
             execution 'ANDROIDX_TEST_ORCHESTRATOR'
         }
-        multiDexEnabled true
         vectorDrawables.useSupportLibrary = true
     }
 

build.gradle

@@ -7,7 +7,7 @@ buildscript {
         maven { url "https://plugins.gradle.org/m2/" }
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.6.3'
+        classpath 'com.android.tools.build:gradle:4.0.0'
         classpath "com.hiya:jacoco-android:0.2"
         classpath 'com.getkeepsafe.dexcount:dexcount-gradle-plugin:0.8.2'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$KOTLIN_VERSION"