Syntax deprecated when Migrate Symfony to 2.7

Hello,

After migration of symfony to 2.7, i  got this notice:

```
DEPRECATED - The "pattern" option in file "/var/www/dev/project/vendor/frequence-web/contact-bundle/FrequenceWeb/Bundle/ContactBundle/Resources/config/routing.xml" is deprecated since version 2.2 and will be removed in 3.0. Use the "path" option in the route definition instead. 
```

Can you fix this.

Thank you
