Automatically exclude [bot] contributors from the changelog

Closes gh-102

README.adoc

@@ -170,14 +170,15 @@ changelog:
 
 === Excluding Contributors
 
-If you have contributors that you don't want to thank (perhaps core team members or bots), you can set the following:
+Contributors whose username ends with `[bot]`, such as `dependabot[bot]` and `github-actions[bot]`, are automatically excluded.
+If you have other contributors that you want to be excluded (perhaps core team members), you can set the following:
 
 [source,yaml]
 ----
 changelog:
   contributors:
     exclude:
-      names: ["dependabot"]
+      names: ["coremember"]
 ----
 
 You can also use `*` if you want to drop the contributors section entirely.

src/main/java/io/spring/githubchangeloggenerator/ChangelogGenerator.java

@@ -202,7 +202,8 @@ private Issue getPortedReferenceIssue(Issue issue) {
 	}
 
 	private boolean isIncludedContributor(User user) {
-		return !this.excludeContributors.contains(user.getName());
+		String name = user.getName();
+		return !this.excludeContributors.contains(name) && !name.endsWith("[bot]");
 	}
 
 	private void addContributorsContent(StringBuilder content, Set<User> contributors) {

src/test/java/io/spring/githubchangeloggenerator/ChangelogGeneratorTests.java

@@ -190,6 +190,19 @@ void generateWhenMoreThanTwoContributors() throws Exception {
 		assertChangelog("23").hasContent(from("output-with-more-than-two-contributors"));
 	}
 
+	@Test
+	void generateWhenHasBotContributors() throws Exception {
+		User contributor1 = createUser("dependabot[bot]");
+		User contributor2 = createUser("github-actions[bot]");
+		User contributor3 = createUser("contributor");
+		List<Issue> issues = new ArrayList<>();
+		issues.add(newPullRequest("Enhancement 1", "1", Type.ENHANCEMENT, "enhancement-1-url", contributor1));
+		issues.add(newPullRequest("Enhancement 2", "2", Type.ENHANCEMENT, "enhancement-2-url", contributor2));
+		issues.add(newPullRequest("Enhancement 3", "3", Type.ENHANCEMENT, "enhancement-3-url", contributor3));
+		given(this.service.getIssuesForMilestone(23, REPO)).willReturn(issues);
+		assertChangelog("23").hasContent(from("output-with-bot-contributors"));
+	}
+
 	@Test
 	void generateWhenNoIgnoredLabels() throws Exception {
 		User contributor1 = createUser("contributor1");

src/test/resources/io/spring/githubchangeloggenerator/output-with-bot-contributors

@@ -0,0 +1,11 @@
+## :star: New Features
+
+- Enhancement 1 [#1](enhancement-1-url)
+- Enhancement 2 [#2](enhancement-2-url)
+- Enhancement 3 [#3](enhancement-3-url)
+
+## :heart: Contributors
+
+Thank you to all the contributors who worked on this release:
+
+@contributor