Update README.md

doc: moved warning

README.md

@@ -6,15 +6,6 @@
 
 A QR code scanner that works on both iOS and Android by natively embedding the platform view within Flutter. The integration with Flutter is seamless, much better than jumping into a native Activity or a ViewController to perform the scan.
 
-# *Warning*
-If you are using Flutter Beta or Dev channel (1.25 or 1.26) you can get the following error:
-
-`java.lang.AbstractMethodError: abstract method "void io.flutter.plugin.platform.PlatformView.onFlutterViewAttached(android.view.View)"`
-
-This is a bug in Flutter which is being tracked here: https://github.com/flutter/flutter/issues/72185
-
-There is a workaround by adding `android.enableDexingArtifactTransform=false` to your `gradle.properties` file.
-
 ## Screenshots
 <table>
 <tr>
@@ -132,6 +123,15 @@ In ```android/build.gradle``` change ```classpath 'com.android.tools.build:gradl
 
 In ```android/gradle/wrapper/gradle-wrapper.properties``` change ```distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.2-all.zip``` to ```distributionUrl=https\://services.gradle.org/distributions/gradle-6.9-all.zip```
 
+### *Warning*
+If you are using Flutter Beta or Dev channel (1.25 or 1.26) you can get the following error:
+
+`java.lang.AbstractMethodError: abstract method "void io.flutter.plugin.platform.PlatformView.onFlutterViewAttached(android.view.View)"`
+
+This is a bug in Flutter which is being tracked here: https://github.com/flutter/flutter/issues/72185
+
+There is a workaround by adding `android.enableDexingArtifactTransform=false` to your `gradle.properties` file.
+
 ## iOS Integration
 In order to use this plugin, add the following to your Info.plist file:
 ```