Fix PSR-2 incompatibilities

Author: sagikazarmark

src/Exception/ClientException.php

@@ -9,5 +9,4 @@
  */
 class ClientException extends HttpException
 {
-
 }

src/Exception/InvalidArgumentException.php

@@ -11,5 +11,4 @@
  */
 class InvalidArgumentException extends \InvalidArgumentException implements Exception
 {
-
 }

src/Exception/NetworkException.php

@@ -9,5 +9,4 @@
  */
 class NetworkException extends RequestException
 {
-
 }

src/Exception/RuntimeException.php

@@ -11,5 +11,4 @@
  */
 class RuntimeException extends \RuntimeException implements Exception
 {
-
 }

src/Exception/ServerException.php

@@ -9,5 +9,4 @@
  */
 class ServerException extends HttpException
 {
-
 }

src/Exception/TransferException.php

@@ -9,5 +9,4 @@
  */
 class TransferException extends RuntimeException
 {
-
 }