Fix material intro crash. Downgrade to SDK 27 until stable 28 support libs are available.

app/build.gradle

@@ -44,18 +44,23 @@ static def getProperty(@Nullable Properties properties, String name) {
 }
 
 android {
-    compileSdkVersion 28
-    buildToolsVersion '28.0.0'
+    compileSdkVersion 27
+    buildToolsVersion '27.0.3'
     defaultConfig {
         minSdkVersion 16
-        targetSdkVersion 28
+        targetSdkVersion 27
 
-        renderscriptTargetApi 28
+        renderscriptTargetApi 27
         vectorDrawables.useSupportLibrary = true
 
         applicationId 'com.kabouzeid.gramophone'
         versionCode 162
         versionName '1.1.0'
+
+        // needed for material intro!
+        dataBinding {
+            enabled = true
+        }
     }
     signingConfigs {
         release {