Update gradle to 6.2.1 (#705)

.travis.yml

@@ -4,7 +4,7 @@ jdk: oraclejdk8
 env:
  global:
     - ANDROID_API_LEVEL=29
-    - ANDROID_BUILD_TOOLS_VERSION=29.0.2
+    - ANDROID_BUILD_TOOLS_VERSION=29.0.3
 
 cache:
   directories:

app/build.gradle

@@ -10,7 +10,7 @@ apply from: 'hooks.gradle'
 
 android {
     compileSdkVersion 29
-    buildToolsVersion '29.0.2'
+    buildToolsVersion '29.0.3'
 
     defaultConfig {
         applicationId "io.github.wulkanowy"

gradle.properties

@@ -9,7 +9,6 @@
 # The setting is particularly useful for tweaking memory settings.
 android.enableJetifier=true
 android.useAndroidX=true
-android.enableR8=true
 org.gradle.jvmargs=-Xmx1536m
 kapt.incremental.apt=true
 

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.4-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.2.1-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists