Convert table to utf8mb4 instead of utf8

Author: fguillot

Plugin.php

@@ -36,7 +36,7 @@ public function getPluginAuthor()
 
     public function getPluginVersion()
     {
-        return '1.0.0';
+        return '1.0.1';
     }
 
     public function getPluginDescription()

README.md

@@ -9,8 +9,8 @@ For example, it could be used to publish announcements or schedule maintenance.
 Requirements
 ------------
 
-- PHP >= 5.4
-- Kanboard >= 1.1.0
+- PHP >= 5.6
+- Kanboard >= 1.2.3
 
 Installation
 ------------

Schema/Mysql.php

@@ -2,9 +2,16 @@
 
 namespace Kanboard\Plugin\Broadcast\Schema;
 
-const VERSION = 1;
+use PDO;
 
-function version_1($pdo)
+const VERSION = 2;
+
+function version_2(PDO $pdo)
+{
+    $pdo->exec('ALTER TABLE `broadcast_message` CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci');
+}
+
+function version_1(PDO $pdo)
 {
     $pdo->exec('CREATE TABLE IF NOT EXISTS broadcast_message (
         message TEXT NOT NULL,