Update target SDK version to 27

Author: pasin

build-android.gradle

@@ -20,12 +20,12 @@ repositories {
 }
 
 android {
-    compileSdkVersion 22
-    buildToolsVersion "22.0.1"
+    compileSdkVersion 27
+    buildToolsVersion '27.0.3'
 
     defaultConfig {
         minSdkVersion 9
-        targetSdkVersion 22
+        targetSdkVersion 27
         versionCode 1
         versionName "1.0"
     }