Add method getLinks and setLinks

src/Docker/Composer/Service.php

@@ -507,6 +507,24 @@ class Service
         return $this;
     }
 
+    /**
+     * @return $this Return all links
+     */
+    public function getLinks()
+    {
+        return isset($this->config["links"]) ? $this->config["links"] : null;
+    }
+
+    /**
+     * @param array $links Contains links.
+     * @return $this Return this.
+     */
+    public function setLinks($links)
+    {
+        $this->config["links"] = $links;
+        return $this;
+    }
+
     /**
      * @param $driver
      * @param bool $options