FIX connect multiple databases by cloning driver

Author: francerz

README.md

@@ -1,7 +1,7 @@
 SQL Builder
 =======================================
 
-![Packagist](https://img.shields.io/packagist/vpre/francerz/sql-builder)]
+![Packagist](https://img.shields.io/packagist/vpre/francerz/sql-builder)
 ![Build Status](https://github.com/francerz/php-sql-builder/workflows/PHP%20Unit%20Tests/badge.svg)
 
 Installation

src/DriverManager.php

@@ -21,7 +21,7 @@ public static function register(string $name, DriverInterface $driver)
     public static function getDriver(string $name): ?DriverInterface
     {
         if (array_key_exists($name, static::$drivers)) {
-            return static::$drivers[$name];
+            return clone static::$drivers[$name];
         }
         return null;
     }