flutter: target newer SDK

Flutter.md

@@ -28,3 +28,4 @@ Lokaler Package-Import
 dependencies:
   myPackage:
     path: ../myPackage
+* Dann normal importieren, z.B. import"package:myPackage/file123.dart"

createFlutter

@@ -137,7 +137,7 @@ if (keystorePropertiesFile.exists()) {
 
 
 android {
-    compileSdkVersion 28
+    compileSdkVersion 29
 
     lintOptions {
         disable 'InvalidPackage'
@@ -147,7 +147,7 @@ android {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "$org.$packageName"
         minSdkVersion 16
-        targetSdkVersion 28
+        targetSdkVersion 29
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"