From 5cd97193864b7444ba3d13b163caf3e65ee12cec Mon Sep 17 00:00:00 2001
From: Carsten Brandt <mail@cebe.cc>
Date: Wed, 15 Nov 2017 10:42:42 +0100
Subject: [PATCH] Added note about PHP version compatibility

fixes #55
---
 README.md | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/README.md b/README.md
index b82b97e..0879fcf 100644
--- a/README.md
+++ b/README.md
@@ -33,6 +33,14 @@ or add
 
 to the require section of your composer.json.
 
+> Note: Version 2.1 of this extensions uses Swiftmailer 6, which requires PHP 7. If you are using PHP 5, 
+> you have to use version 2.0 of this extension, which uses Swiftmailer 5, which is compatible with 
+> PHP 5.4 and higher. Use the following version constraint in that case:
+> 
+> ```json
+> "yiisoft/yii2-swiftmailer": "~2.1.0"
+> ```
+
 Usage
 -----