Include related tickets in changelog.

Author: mp911de

src/main/java/org/springframework/data/release/issues/TicketReference.java

@@ -62,6 +62,10 @@ public boolean isIssue() {
 		return getReference() == Reference.Ticket;
 	}
 
+	public boolean isRelated() {
+		return getReference() == Reference.Related;
+	}
+
 	public boolean isPullRequest() {
 		return getReference() == Reference.PullRequest;
 	}

src/main/java/org/springframework/data/release/issues/github/ChangelogGenerator.java

@@ -18,7 +18,6 @@
 
 import lombok.Getter;
 
-import java.util.Arrays;
 import java.util.Collections;
 import java.util.Comparator;
 import java.util.HashSet;
@@ -30,8 +29,6 @@
 import java.util.regex.Pattern;
 import java.util.stream.Collectors;
 
-import org.springframework.stereotype.Component;
-
 /**
  * Generates a changelog markdown file which includes bug fixes, enhancements and contributors for a given milestone.
  *
@@ -81,7 +78,8 @@ private String generateContent(List<ChangeItem> issues,
 			BiFunction<ChangelogSection, String, String> sectionContentPostProcessor, boolean includeIssueNumbers) {
 		StringBuilder content = new StringBuilder();
 		addSectionContent(content,
-				this.sections.collate(issues.stream().filter(it -> it.getReference().isIssue()).map(ChangeItem::getIssue).collect(Collectors.toList())),
+				this.sections.collate(issues.stream().filter(it -> it.getReference().isIssue() || it.getReference().isRelated())
+						.map(ChangeItem::getIssue).collect(Collectors.toList())),
 				sectionContentPostProcessor, includeIssueNumbers);
 		Set<GitHubUser> contributors = getContributors(issues);
 		if (!contributors.isEmpty()) {