Android: use API 28

Author: fabriziomoscon

android/build.gradle

@@ -23,10 +23,10 @@ allprojects {
 
 apply plugin: 'com.android.library'
 
-def DEFAULT_COMPILE_SDK_VERSION = 27
-def DEFAULT_BUILD_TOOLS_VERSION = "27.0.3"
-def DEFAULT_TARGET_SDK_VERSION = 27
-def DEFAULT_SUPPORT_LIB_VERSION = "27.0.2"
+def DEFAULT_COMPILE_SDK_VERSION = 28
+def DEFAULT_BUILD_TOOLS_VERSION = "28.0.3"
+def DEFAULT_TARGET_SDK_VERSION = 28
+def DEFAULT_SUPPORT_LIB_VERSION = "28.0.0"
 
 android {
     compileSdkVersion rootProject.hasProperty('compileSdkVersion') ? rootProject.compileSdkVersion : DEFAULT_COMPILE_SDK_VERSION