Updated to version 2.30.4 for release

android-project/app/src/main/java/org/libsdl/app/SDLActivity.java

@@ -61,7 +61,7 @@ public class SDLActivity extends Activity implements View.OnSystemUiVisibilityCh
     private static final String TAG = "SDL";
     private static final int SDL_MAJOR_VERSION = 2;
     private static final int SDL_MINOR_VERSION = 30;
-    private static final int SDL_MICRO_VERSION = 3;
+    private static final int SDL_MICRO_VERSION = 4;
 /*
     // Display InputType.SOURCE/CLASS of events and devices
     //