Add coverage for Event class (#141)

Add coverage for Event class

Author: RicardoGeek

src/main/java/com/nylas/Event.java

@@ -327,7 +327,7 @@ public void clearParticipants() {
 	 * @return If the event is valid
 	 */
 	public boolean isValid() {
-		return conferencing == null || conferencing.getAutocreate() == null || conferencing.getDetails() == null &&
+ 		return conferencing == null || conferencing.getAutocreate() == null || conferencing.getDetails() == null &&
 				(this.capacity == null || capacity == -1 || nullOrEmpty(this.participants) || this.participants.size() <= this.capacity);
 	}