Cleaned up some things related to AutoClosable

src/main/java/org/gitlab4j/api/GitLabApi.java

 package org.gitlab4j.api;
 
-import java.io.Closeable;
 import java.util.Collections;
 import java.util.List;
 import java.util.Map;

src/test/java/org/gitlab4j/api/TestAccessToken.java

@@ -68,5 +68,7 @@ public class TestAccessToken extends AbstractIntegrationTest {
         System.out.format("tokenType: %s, version=%s, revision=%s%n", TokenType.ACCESS, gitLabApi.getIgnoreCertificateErrors(), version.getVersion(), version.getRevision());
         assertNotNull(version.getVersion());
         assertNotNull(version.getRevision());
+
+        gitLabApi.close();
     }
 }

src/test/java/org/gitlab4j/api/TestAvatarUpload.java

@@ -82,6 +82,8 @@ public class TestAvatarUpload extends AbstractIntegrationTest {
         Project updatedProject = gitLabApi.getProjectApi().setProjectAvatar(testProject.getId(), avatarFile);
         assertNotNull(updatedProject);
         assertTrue(updatedProject.getAvatarUrl().endsWith(AVATAR_FILENAME));
+
+        gitLabApi.close();
     }
 
     @Test

src/test/java/org/gitlab4j/api/TestFileUpload.java

@@ -90,5 +90,7 @@ public class TestFileUpload extends AbstractIntegrationTest {
         File fileToUpload = new File("README.md");
         FileUpload fileUpload = gitLabApi.getProjectApi().uploadFile(project.getId(), fileToUpload, null);
         assertNotNull(fileUpload);
+
+        gitLabApi.close();
     }
 }

src/test/java/org/gitlab4j/api/TestGitLabApi.java

@@ -69,5 +69,7 @@ public class TestGitLabApi extends AbstractIntegrationTest {
         System.out.format("version=%s, revision=%s%n", version.getVersion(), version.getRevision());
         assertNotNull(version.getVersion());
         assertNotNull(version.getRevision());
+
+        gitLabApi.close();
     }
 }

src/test/java/org/gitlab4j/api/TestIgnoreCertificateErrors.java

@@ -85,6 +85,7 @@ public class TestIgnoreCertificateErrors implements PropertyConstants {
         System.out.format("ignoreCertErrors: %b, version=%s, revision=%s%n", gitLabApi.getIgnoreCertificateErrors(), version.getVersion(), version.getRevision());
         assertNotNull(version.getVersion());
         assertNotNull(version.getRevision());
+        gitLabApi.close();
 
         gitLabApi = new GitLabApi(ApiVersion.V4, TEST_HOST_URL, TEST_PRIVATE_TOKEN);
         gitLabApi.setIgnoreCertificateErrors(true);
@@ -102,5 +103,7 @@ public class TestIgnoreCertificateErrors implements PropertyConstants {
         System.out.format("ignoreCertErrors: %b, version=%s, revision=%s%n", gitLabApi.getIgnoreCertificateErrors(), version.getVersion(), version.getRevision());
         assertNotNull(version.getVersion());
         assertNotNull(version.getRevision());
+
+        gitLabApi.close();
     }
 }

src/test/java/org/gitlab4j/api/TestProjectApi.java

@@ -196,6 +196,7 @@ public class TestProjectApi extends AbstractIntegrationTest {
         GitLabApi gitLabApi = new GitLabApi(TEST_HOST_URL, "");
         List<Project> projects = gitLabApi.getProjectApi().getProjects(1, 1);
         assertTrue(projects != null);
+        gitLabApi.close();
     }
 
     @Test