should use GET rather than PUT when get a tree of a projecct

pom.xml

@@ -2,7 +2,7 @@
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
 
 	<modelVersion>4.0.0</modelVersion>
-	<groupId>com.messners</groupId>
+	<groupId>com.alibaba.platform.shared</groupId>
 	<artifactId>gitlab-api</artifactId>
 	<packaging>jar</packaging>
 	<version>2.0.2-SNAPSHOT</version>

src/main/java/com/messners/gitlab/api/RepositoryApi.java

@@ -129,10 +129,10 @@ public class RepositoryApi extends AbstractApi {
 	 * 
 	 * @param projectId
 	 * @return a tree with the directories and files of a project
-	 * @throws GitLabApiException 
+	 * @throws GitLabApiException
 	 */
 	public List<TreeItem> getTree (Integer projectId) throws GitLabApiException {		
-		Response response = put(Response.Status.OK, null, "projects", projectId, "repository", "tree");
+		Response response = get(Response.Status.OK, null, "projects", projectId, "repository", "tree");
 		return (response.readEntity(new GenericType<List<TreeItem>>() {}));
 	}