update to 0.8.16 (#376)

Corona-Warn-App/build.gradle

@@ -32,8 +32,8 @@ android {
         applicationId 'de.rki.coronawarnapp'
         minSdkVersion 23
         targetSdkVersion 29
-        versionCode 23
-        versionName "0.8.15"
+        versionCode 24
+        versionName "0.8.16"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
 
         buildConfigField "String", "DOWNLOAD_CDN_URL", "\"$DOWNLOAD_CDN_URL\""