change migration namespace

Doctrine/Migrations/VersionComparator.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace Chill\MainBundle\Doctrine\Migrations;
+
+use Doctrine\Migrations\Version\Comparator;
+use Doctrine\Migrations\Version\Version;
+
+use function strcmp;
+use function explode;
+
+/**
+ * Compare Version classes names from different namespaces and order them.
+ *
+ * Version are compared on the date's class.
+ */
+final class VersionComparator implements Comparator
+{
+    private function getNumber(Version $version): string
+    {
+        $names = explode("\\", (string) $version);
+
+        return end($names);
+    }
+
+    public function compare(Version $a, Version $b): int
+    {
+        $q = strcmp($this->getNumber($a), $this->getNumber($b));
+
+        return $q;
+    }
+}
+