Make this compatible with 2.1

[tminsaas]

Hi, how can I use this bundle with the latest 2.1 release of eZ Platform?

When including the latest v1.5.0 in composer.json i get this message when running composer update:

Your requirements could not be resolved to an installable set of packages.

Problem 1
- Installation request for ezplatform-i18n/ezplatform-i18n-nb_no ^1.5 -> satisfiable by ezplatform-i18n/ezplatform-i18n-nb_no[v1.5.0].
- ezplatform-i18n/ezplatform-i18n-nb_no v1.5.0 requires ezsystems/ezpublish-kernel ^6.8 -> satisfiable by ezsystems/ezpublish-kernel[6.10.x-dev, 6.11.x-dev, 6.12.x-dev, 6.13.x-dev, 6.8.x-dev, 6.9.x-dev, v6.10.0, v6.10.0-beta1, v6.10.0-beta2, v6.10.0-beta3, v6.10.0-rc1, v6.10.0-rc2, v6.10.0-rc3, v6.10.1, v6.10.1-rc1, v6.11.0, v6.11.0-beta1, v6.11.0-rc1, v6.11.1, v6.11.2, v6.11.3, v6.11.4, v6.11.4.1, v6.12.0, v6.12.0-beta1, v6.12.0-beta2, v6.12.0-rc1, v6.12.0.1, v6.12.0.2, v6.12.1, v6.12.1-rc1, v6.12.1-rc2, v6.12.1-rc3, v6.12.1-rc4, v6.12.1.1, v6.13.0, v6.13.0-beta1, v6.13.0-beta2, v6.13.0-rc1, v6.13.0.1, v6.13.1, v6.13.1-rc1, v6.13.1.1, v6.13.1.2, v6.13.2-beta1, v6.13.2-rc1, v6.8.0, v6.8.0-beta1, v6.8.0-rc1, v6.8.1, v6.8.1-rc1, v6.9.0, v6.9.0-beta1, v6.9.0-rc1, v6.9.1, v6.9.1-rc1, v6.9.1-rc2] but these conflict with your requirements or minimum-stability.