flutter android sync dependency info update

Author: vaind

objectbox/README.md

@@ -68,7 +68,8 @@ dev_dependencies:
 ```
 
 * Install the packages: `flutter pub get`
-* XCode/iOS: under Architectures replace `${ARCHS_STANDARD)` with `arm64` (or `$ARCHS_STANDARD_64_BIT`). See [FAQ](#faq) for details.
+* XCode/iOS only: increase the deployment target to iOS 11 and, under Architectures, replace `${ARCHS_STANDARD}` with `arm64` (or `$ARCHS_STANDARD_64_BIT`). See [FAQ](#faq) for details.
+* Sync + Android only: in your `android/app/build.gradle` set `minSdkVersion 21` in section `android -> defaultConfig`. 
 
 ### Dart Native
 

objectbox/example/flutter/objectbox_demo_sync/android/app/build.gradle

@@ -38,7 +38,7 @@ android {
 
     defaultConfig {
         applicationId "com.example.objectbox_demo"
-        minSdkVersion 16
+        minSdkVersion 21
         targetSdkVersion 28
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName

sync_flutter_libs/android/build.gradle

@@ -3,7 +3,7 @@ android {
     compileSdkVersion 28
 
     defaultConfig {
-        minSdkVersion 16
+        minSdkVersion 21
     }
     lintOptions {
         disable 'InvalidPackage'
@@ -16,5 +16,5 @@ repositories {
 
 dependencies {
     // https://search.maven.org/search?q=g:io.objectbox%20objectbox-sync-android
-    implementation "io.objectbox:objectbox-sync-android:2.9.2-RC@aar"
+    implementation "io.objectbox:objectbox-sync-android:2.9.2-RC"
 }