Resolve "[Queue-2.0] Serializable course page filter"

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Closes #488 (closed)

src/main/java/nl/tudelft/queue/dto/util/EditionFilterDTO.java

@@ -17,6 +17,7 @@
  */
 package nl.tudelft.queue.dto.util;
 
+import java.io.Serializable;
 import java.util.List;
 
 import lombok.AllArgsConstructor;
@@ -28,7 +29,9 @@ import lombok.NoArgsConstructor;
 @NoArgsConstructor
 @AllArgsConstructor
 @EqualsAndHashCode(callSuper = false)
-public class EditionFilterDTO {
+public class EditionFilterDTO implements Serializable {
+	private static final long serialVersionUID = 8524380516959311037L;
+
 	/**
 	 * A list of programmes the edition needs to be a part of.
 	 */