Update 'README.md'

README.md

 Add following repository records into `composer.json`
 ```json
 {
-  "repositories": [
-    {
-      "type": "vcs",
-      "url": "https://git.mirfalah.my/mirfalah-tech/sendmail-swift-transport.git"
-    },
-    {
-      "type": "vcs",
-      "url": "https://git.mirfalah.my/mirfalah-tech/laravel-swift.git"
-    }
-  ]
+  "repositories": [{
+    "type": "composer",
+    "url": "http://composer.mirfalah.my"
+  }
 }
 ```
 Then execute