From 42ea303cfea00a10212f0558adc9524e6944eefa Mon Sep 17 00:00:00 2001
From: Liam O'Boyle <liam@ontheroad.net.nz>
Date: Tue, 3 Mar 2015 11:47:28 +1100
Subject: [PATCH] Return self from NativeMailerHandler::addHeader().

NativeMailerHandler::setContentType() and NativeMailerHandler::setEncoding()
both return the NativeMailerHandler object, allowing a fluent coding
style.  This fix adds the same behaviour to NativeMailerHandler::addHeader()
for so that all public non-inherited methods behave this way for
consistency.
---
 src/Monolog/Handler/NativeMailerHandler.php | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/Monolog/Handler/NativeMailerHandler.php b/src/Monolog/Handler/NativeMailerHandler.php
index b3318f0a..2093b634 100644
--- a/src/Monolog/Handler/NativeMailerHandler.php
+++ b/src/Monolog/Handler/NativeMailerHandler.php
@@ -78,7 +78,7 @@ class NativeMailerHandler extends MailHandler
      * Add headers to the message
      *
      * @param  string|array $headers Custom added headers
-     * @return null
+     * @return self
      */
     public function addHeader($headers)
     {
@@ -88,6 +88,8 @@ class NativeMailerHandler extends MailHandler
             }
             $this->headers[] = $header;
         }
+
+        return $this;
     }
 
     /**