title: Expected Android API level 21+ but was 30
body: <p>How is it possible that I get this message? It does not make any sense.
  I'm using <code>com.squareup.retrofit2:retrofit:2.9.0</code></p>
  <pre><code>     Caused by: java.lang.IllegalStateException: Expected Android API level 21+ but was 30
      at okhttp3.internal.platform.AndroidPlatform$Companion.buildIfSupported(AndroidPlatform.kt:370)
      at okhttp3.internal.platform.Platform$Companion.findPlatform(Platform.kt:204)
      at okhttp3.internal.platform.Platform$Companion.access$findPlatform(Platform.kt:178)
      2020-09-16 12:37:07.645 6480-6480/lv.ltt.gasogmp.dev_v3 E/AndroidRuntime:     at 
      okhttp3.internal.platform.Platform.&lt;clinit&gt;(Platform.kt:179)
  </code></pre>