Made most classes final (#310)

* Made most classes final

* bugfix

src/Mailgun/Assert.php

@@ -16,7 +16,7 @@ use Mailgun\Exception\InvalidArgumentException;
  *
  * @author Tobias Nyholm <tobias.nyholm@gmail.com>
  */
-class Assert extends \Webmozart\Assert\Assert
+final class Assert extends \Webmozart\Assert\Assert
 {
     protected static function reportInvalidArgument($message)
     {

src/Mailgun/HttpClient/Plugin/History.php

@@ -19,7 +19,7 @@ use Psr\Http\Message\ResponseInterface;
  *
  * @author Tobias Nyholm <tobias.nyholm@gmail.com>
  */
-class History implements Journal
+final class History implements Journal
 {
     /**
      * @var ResponseInterface

src/Mailgun/HttpClientConfigurator.php

@@ -22,7 +22,7 @@ use Mailgun\HttpClient\Plugin\History;
  *
  * @author Tobias Nyholm <tobias.nyholm@gmail.com>
  */
-class HttpClientConfigurator
+final class HttpClientConfigurator
 {
     /**
      * @var string

src/Mailgun/Hydrator/ArrayHydrator.php

@@ -17,7 +17,7 @@ use Psr\Http\Message\ResponseInterface;
  *
  * @author Tobias Nyholm <tobias.nyholm@gmail.com>
  */
-class ArrayHydrator implements Hydrator
+final class ArrayHydrator implements Hydrator
 {
     /**
      * @param ResponseInterface $response

src/Mailgun/Hydrator/ModelHydrator.php

@@ -18,7 +18,7 @@ use Psr\Http\Message\ResponseInterface;
  *
  * @author Tobias Nyholm <tobias.nyholm@gmail.com>
  */
-class ModelHydrator implements Hydrator
+final class ModelHydrator implements Hydrator
 {
     /**
      * @param ResponseInterface $response

src/Mailgun/Hydrator/NoopHydrator.php

@@ -16,7 +16,7 @@ use Psr\Http\Message\ResponseInterface;
  *
  * @author Tobias Nyholm <tobias.nyholm@gmail.com>
  */
-class NoopHydrator implements Hydrator
+final class NoopHydrator implements Hydrator
 {
     /**
      * @param ResponseInterface $response

tests/Functional/MessageBuilderHeaderTest.php

@@ -23,7 +23,7 @@ class MessageBuilderHeaderTest extends \PHPUnit_Framework_TestCase
         };
 
         // Create the mocked mailgun client.
-        $mailgun = MockedMailgun::create($this, 'POST', 'domain/messages', [], $messageValidator);
+        $mailgun = MockedMailgun::createMock($this, 'POST', 'domain/messages', [], $messageValidator);
 
         $builder = $mailgun->MessageBuilder();