Make EventPublishingRunListener Ordered `0`

Update EventPublishingRunListener to implement Ordered and use a default
order of 0. This allows for other run listeners to be added either
before or after it.

Fixes gh-3305

spring-boot/src/main/java/org/springframework/boot/context/event/EventPublishingRunListener.java

@@ -25,6 +25,7 @@ import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.context.event.ApplicationEventMulticaster;
 import org.springframework.context.event.SimpleApplicationEventMulticaster;
 import org.springframework.context.support.AbstractApplicationContext;
+import org.springframework.core.Ordered;
 import org.springframework.core.env.ConfigurableEnvironment;
 
 /**
@@ -32,7 +33,7 @@ import org.springframework.core.env.ConfigurableEnvironment;
  *
  * @author Phillip Webb
  */
-public class EventPublishingRunListener implements SpringApplicationRunListener {
+public class EventPublishingRunListener implements SpringApplicationRunListener, Ordered {
 
 	private final ApplicationEventMulticaster multicaster;
 
@@ -49,6 +50,11 @@ public class EventPublishingRunListener implements SpringApplicationRunListener
 		}
 	}
 
+	@Override
+	public int getOrder() {
+		return 0;
+	}
+
 	@Override
 	public void started() {
 		publishEvent(new ApplicationStartedEvent(this.application, this.args));