Remove minSdkVersion 21

{{cookiecutter.out_dir}}/android/app/build.gradle

@@ -41,17 +41,12 @@ android {
     }
 
     defaultConfig {
-        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "{{ cookiecutter.org_name }}.{{ cookiecutter.project_name }}"
-        // You can update the following values to match your application needs.
-        // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration.
         minSdkVersion flutter.minSdkVersion
         targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
 
-        minSdkVersion 21
-
         ndk {
             abiFilters 'arm64-v8a', 'armeabi-v7a'
         }
@@ -59,8 +54,6 @@ android {
 
     buildTypes {
         release {
-            // TODO: Add your own signing config for the release build.
-            // Signing with the debug keys for now, so `flutter run --release` works.
             signingConfig signingConfigs.debug
         }
     }