Update 'README.md'

README.md

@@ -8,10 +8,12 @@ Mirfalah Sendmail Swift_Transport implementation
 Add following repository record into `composer.json`
 ```json
 {
-  "repositories": [{
-    "type": "composer",
-    "url": "http://composer.mirfalah.my"
-  }
+  "repositories": [
+    {
+      "type": "composer",
+      "url": "http://composer.mirfalah.my"
+    }
+  ]
 }
 ```
 Then execute