Binding the AMNL/Mollie lib at v1.0.*

It seems the maintainer of AMNL/Mollie has removed the RC3 packagist entry, so a simple ``composer update`` which includes the MollieBundle fails with the following message:

    Your requirements could not be resolved to an installable set of packages.
    
      Problem 1
        - Installation request for ruudk/mollie-bundle dev-master -> satisfiable by ruudk/mollie-bundle[dev-master].
        - ruudk/mollie-bundle dev-master requires amnl/mollie v0.0.1-RC03 -> no matching package found.

As v1.0.0 is available, we can bind the MollieBundle to the v1.0.* range. By binding to a .* mini release, we prevent the Bundle from collapsing when one packagist entry is removed.

This change has been verified by running it against my current project. The normal Mollie workflow seems to work.