Newer version of the Kotlin Gradle

[JohanScheepers]

hi,

If I change my build.gradle to minSdkVersion 20 my app fails to build

┌─ Flutter Fix ──────────────────────────────────────────────────────────────────────────────┐
│ [!] Your project requires a newer version of the Kotlin Gradle plugin. │
│ Find the latest version on https://kotlinlang.org/docs/releases.html#release-details, then │
│ update D:\FlutterProjects\xxxxxx\android\build.gradle: │
│ ext.kotlin_version = '' │
└─────────────────────────────────────────────────────────────────────────────

Can you update this package?

Thank you