Adding Git Changelog Maven Plugin (#301)

.gitignore

@@ -44,3 +44,5 @@ target/
 
 # Test properties file for gitlab4j
 test-gitlab4j.properties
+
+.okhttpcache

CHANGELOG.mustache

+# Changelog
+Changelog of GitLab4J API.
+
+{{#tags}}
+## {{name}}
+ {{#issues}}
+  {{#hasIssue}}
+   {{#hasLink}}
+### {{name}} [{{issue}}]({{link}}) {{title}} {{#hasIssueType}} *{{issueType}}* {{/hasIssueType}} {{#hasLabels}} {{#labels}} *{{.}}* {{/labels}} {{/hasLabels}}
+   {{/hasLink}}
+   {{^hasLink}}
+### {{name}} {{issue}} {{title}} {{#hasIssueType}} *{{issueType}}* {{/hasIssueType}} {{#hasLabels}} {{#labels}} *{{.}}* {{/labels}} {{/hasLabels}}
+   {{/hasLink}}
+  {{/hasIssue}}
+  {{^hasIssue}}
+### {{name}}
+  {{/hasIssue}}
+
+  {{#commits}}
+**{{{messageTitle}}}**
+
+{{#messageBodyItems}}
+ * {{.}}
+{{/messageBodyItems}}
+
+[{{hash}}](https://github.com/{{ownerName}}/{{repoName}}/commit/{{hash}}) {{authorName}} *{{commitTime}}*
+
+  {{/commits}}
+
+ {{/issues}}
+{{/tags}}
+

pom.xml

@@ -50,6 +50,7 @@
 		<systemRules.version>1.18.0</systemRules.version>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+		<changelog-lib.version>1.59</changelog-lib.version>
 	</properties>
 
 	<scm>
@@ -195,6 +196,25 @@
 					</systemPropertyVariables>
 				</configuration>
 			</plugin>
+
+			<plugin>
+				<groupId>se.bjurr.gitchangelog</groupId>
+				<artifactId>git-changelog-maven-plugin</artifactId>
+				<version>${changelog-lib.version}</version>
+				<executions>
+					<execution>
+						<id>GenerateGitChangelog</id>
+						<phase>generate-sources</phase>
+						<goals>
+							<goal>git-changelog</goal>
+						</goals>
+						<configuration>
+							<readableTagName>gitlab4j-api-(.*)</readableTagName>
+							<templateFile>CHANGELOG.mustache</templateFile>
+						</configuration>
+					</execution>
+				</executions>
+			</plugin>
 		</plugins>
 	</build>