fix: Package Private for MediaResponse

Author: ChristopheCVB

src/main/java/net/twasi/obsremotejava/events/responses/MediaResponse.java

@@ -2,7 +2,7 @@
 
 import net.twasi.obsremotejava.requests.ResponseBase;
 
-public abstract class MediaResponse extends ResponseBase {
+abstract class MediaResponse extends ResponseBase {
     private String sourceName;
     private String sourceKind;