fix postgresql 12 create schema

lib/Doctrine/DBAL/Schema/PostgreSqlSchemaManager.php

@@ -289,7 +289,14 @@ class PostgreSqlSchemaManager extends AbstractSchemaManager
             $sequenceName = $sequence['relname'];
         }
 
+        $version = (float)$this->_conn->getWrappedConnection()->getServerVersion();
+
+        if ($version >= 10) {
+            $data = $this->_conn->fetchAll('SELECT min_value, increment_by FROM pg_sequences WHERE schemaname = \'public\' AND sequencename = ' . $this->_conn->quote($sequenceName));
+        }
+        else {
             $data = $this->_conn->fetchAll('SELECT min_value, increment_by FROM ' . $this->_platform->quoteIdentifier($sequenceName));
+        }
 
         return new Sequence($sequenceName, $data[0]['increment_by'], $data[0]['min_value']);
     }