⬆️ Bumping example's android sdk minimum version to 21.

AlexV525 · AlexV525 · commit 4c69504e7b77 · 2020-07-13T16:48:39.000+08:00
diff --git a/example/android/app/build.gradle b/example/android/app/build.gradle
@@ -39,7 +39,7 @@ android {
 
     defaultConfig {
         applicationId "com.fluttercandies.wechatAssetsPickerExample"
-        minSdkVersion 16
+        minSdkVersion 21
         targetSdkVersion 29
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
