Update compile/target SDK versions to 28 (#48)

Author: c0state

android/build.gradle

@@ -4,7 +4,7 @@ buildscript {
         buildToolsVersion = "28.0.2"
         minSdkVersion = 16
         compileSdkVersion = 28
-        targetSdkVersion = 27
+        targetSdkVersion = 28
         supportLibVersion = "28.0.0"
     }
     repositories {
@@ -20,8 +20,8 @@ buildscript {
 apply plugin: 'com.android.library'
 
 android {
-    compileSdkVersion 27
-    buildToolsVersion "27.0.3"
+    compileSdkVersion 28
+    buildToolsVersion "28.0.3"
 
     defaultConfig {
         minSdkVersion 16
@@ -52,4 +52,4 @@ dependencies {
     implementation 'com.jakewharton.timber:timber:4.7.1'
     implementation "com.google.code.gson:gson:2.8.5"
 }
-  
+