Update README syntax

Author: moux2003

README.md

@@ -5,37 +5,41 @@ to make it compatiable with SwiftMailer.
 
 ## Installation Example
 
-parameters.yml.dist
-```
-parameters:
-    sendgrid_api_key: PleaseEnterSendGridApiKey
-```
+`composer require expertcoder/swiftmailer-send-grid-bundle`
 
-config.yml
-```
-swiftmailer:
-    transport: expertcoder_swift_mailer.send_grid.transport
-    
-expert_coder_swiftmailer_send_grid:
-    api_key: %sendgrid_api_key%
-    categories: [my_app] # optional, will be added to all mails sent
-```
+**or**
+
+*composer.json*
+```json
+"require": {
+    ...
+    "expertcoder/swiftmailer-send-grid-bundle": "~1.0"
+}
 
-AppKernel.php
 ```
+
+*AppKernel.php*
+```php
 $bundles = [
-    .......
+    // ...
     new ExpertCoder\Swiftmailer\SendGridBundle\ExpertCoderSwiftmailerSendGridBundle(),
 ];
 ```
 
-composer.json
+*parameters.yml.dist*
+```yml
+parameters:
+    sendgrid_api_key: PleaseEnterSendGridApiKey
 ```
-"require": {
-    .....
-    "expertcoder/swiftmailer-send-grid-bundle": "@dev"
-}
 
+*config.yml*
+```yml
+swiftmailer:
+    transport: expertcoder_swift_mailer.send_grid.transport
+    
+expert_coder_swiftmailer_send_grid:
+    api_key: %sendgrid_api_key%
+    categories: [my_category] # optional, will be added to all mails sent
 ```
 
 ## Important !