A bit more clear formatting for readme

Author: lalshe

README.md

@@ -1,17 +1,16 @@
-
 # PHP OpenTracing API using Jaeger 
 
-
 ## Installation
 
-```
+```bash
 composer require code-tool/jaeger-client-php
 ```
 
 ## Getting Started
 
-It is strictly advised to use any form of DI container (e.g. [Symfony](https://github.com/code-tool/jaeger-client-symfony-bridge)).
-```$xslt
+It is strictly advised to use any form of DI container (e.g. [Symfony Bundle](https://github.com/code-tool/jaeger-client-symfony-bridge)).
+
+```php
 <?php
 
 $span = $tracer->start('Parent Operation Name', [new StringTag('test.tag', 'Hello world in parent')]);