update version missing

Author: wuan

app/build.gradle

@@ -11,7 +11,7 @@ android {
         applicationId "org.blitzortung.android.app"
         minSdkVersion 15
         targetSdkVersion 29
-        versionCode 246
+        versionCode 247
         versionName "2.0.15"
         multiDexEnabled true
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"