Fix migration to also work with PostgreSQL (issue #170)

Author: ilveroluca

config/Migrations/20210101154551_Initial.php

@@ -362,7 +362,7 @@ public function up()
                 'limit' => null,
                 'null' => true,
             ])
-            ->addColumn('picture', 'blob', [
+            ->addColumn('picture', 'binary', [
                 'default' => null,
                 'null' => true,
             ])
@@ -457,7 +457,7 @@ public function up()
                 'limit' => null,
                 'null' => true,
             ])
-            ->addColumn('picture', 'blob', [
+            ->addColumn('picture', 'binary', [
                 'default' => null,
                 'null' => true,
             ])