Made some classes final

Author: GrahamCampbell

src/HttpClient/Plugin/Authentication.php

@@ -25,7 +25,7 @@
  * @author Tobias Nyholm <[email protected]>
  * @author Graham Campbell <[email protected]>
  */
-class Authentication implements Plugin
+final class Authentication implements Plugin
 {
     /**
      * The authorization header.

src/HttpClient/Plugin/ExceptionThrower.php

@@ -32,7 +32,7 @@
  * @author Fabien Bourigault <[email protected]>
  * @author Graham Campbell <[email protected]>
  */
-class ExceptionThrower implements Plugin
+final class ExceptionThrower implements Plugin
 {
     /**
      * Handle the request and return the response coming from the next callable.

src/HttpClient/Plugin/History.php

@@ -24,7 +24,7 @@
  * @author Tobias Nyholm <[email protected]>
  * @author Graham Campbell <[email protected]>
  */
-class History implements Journal
+final class History implements Journal
 {
     /**
      * The last response.

tests/AnalysisTest.php

@@ -21,7 +21,7 @@
  *
  * @author Graham Campbell <[email protected]>
  */
-class AnalysisTest extends TestCase
+final class AnalysisTest extends TestCase
 {
     use AnalysisTrait;
 

tests/ClientTest.php

@@ -22,7 +22,7 @@
  *
  * @author Graham Campbell <[email protected]>
  */
-class ClientTest extends TestCase
+final class ClientTest extends TestCase
 {
     public function testCreateClient()
     {