FIX: Phinx migration up/down

Author: Ti-Tom

db/migrations/20180927071437_allow_null_on_docs_updated_at_cols.php

@@ -2,8 +2,10 @@
 
 use Phinx\Migration\AbstractMigration;
 
-class AllowNullOnDocsUpdatedAtCols extends AbstractMigration {
-    public function change() {
+class AllowNullOnDocsUpdatedAtCols extends AbstractMigration
+{
+    public function up()
+    {
         $this->table('documents')
             ->changeColumn('updated_at', 'datetime', ['null' => true])
             ->changeColumn('updated_by', 'string', ['null' => true])
@@ -13,4 +15,15 @@ public function change() {
             ->changeColumn('updated_by', 'string', ['null' => true])
             ->update();
     }
+    public function down()
+    {
+        $this->table('documents')
+            ->changeColumn('updated_at', 'datetime')
+            ->changeColumn('updated_by', 'string')
+            ->update();
+        $this->table('folders')
+            ->changeColumn('updated_at', 'datetime')
+            ->changeColumn('updated_by', 'string')
+            ->update();
+    }
 }