Close replay file zip after recording (fixes #32)

src/main/java/com/replaymod/recording/packet/PacketListener.java

@@ -129,6 +129,7 @@ public class PacketListener extends ChannelInboundHandlerAdapter {
         synchronized (replayFile) {
             try {
                 replayFile.save();
+                replayFile.close();
             } catch (IOException e) {
                 logger.error("Saving replay file:", e);
             }