fix version constraint to doctrine/phpcr-odm package

The setFallbackLocales() method in the locale chooser of the doctrine/phpcr-odm package was first added on March 1st. Thus, 1.1.0-RC1 or higher of doctrine/phpcr-odm is required.

Unfortunately, this proposed change doesn't solve the issue. As you can see [here](https://travis-ci.org/xabbuh/SeoBundle/jobs/27011434), Composer isn't able to resolve the dependencies.
Afaics it needs to stay. Otherwise you might get an older version of the ``doctrine/phpcr-odm`` which doesn't have the ``setFallbackLocales()`` method.