Changed doctrine/mongodb require setting

To be able to use it with `ext-mongo [1.3.3]`. Otherwise this error occured:

`Problem 1
    - Installation request for iampersistent/mongodb-acl-bundle dev-master@dev -> satisfiable by iampersistent/mongodb-acl-bundle dev-master.
    - iampersistent/mongodb-acl-bundle dev-master requires doctrine/mongodb 1.0.x-dev -> no matching package found.`