build: update build tools

.travis.yml

@@ -7,7 +7,7 @@ android:
     - platform-tools
     - tools
     - extra-android-m2repository
-    - build-tools-28.0.2
+    - build-tools-28.0.3
     - android-27
 
 script: cd Clover && ./gradlew build --console plain -x lint

Clover/app/build.gradle

@@ -15,7 +15,7 @@ def getCommitHash = { ->
 android {
     compileSdkVersion 27
     // update the travis config when changing this
-    buildToolsVersion '28.0.2'
+    buildToolsVersion '28.0.3'
 
     defaultConfig {
         minSdkVersion 15

Clover/build.gradle

@@ -5,7 +5,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.2.0'
+        classpath 'com.android.tools.build:gradle:3.2.1'
     }
 }