Added a blank line to PushEventListener

Author: nimirum

tmc-plugin/src/fi/helsinki/cs/tmc/model/PushEventListener.java

@@ -4,6 +4,7 @@
 import fi.helsinki.cs.tmc.events.TmcEvent;
 import fi.helsinki.cs.tmc.events.TmcEventBus;
 import fi.helsinki.cs.tmc.events.TmcEventListener;
+
 import java.net.URI;
 import java.util.HashMap;
 import java.util.Map;