update dependency on lo-dash and compatible postal version

[SoundLogic]

Thanks for the great plugin, it is very useful! It helped me avoid a much more code heavy tight-augmentation approach. This plugin works with the latest version of postal.js (1.0.2) - any reason the dependency should not be updated? Also, is there really a need to declare a dependency on lo-dash when it's just a pass-through and given postal.js already declares a dependency on lo-dash? Happy to submit a pull request.

[dantman]

This issue is getting worse as npm is now emitting deprecated notices when installing.

Could maintenance at least be opened up to others willing to update deps and to minor maintenance.

[cordovapolymer]

@ifandelse bump!

[judehansen]

this worked for me to override the dependency

"overrides": {
        "postal.request-response": {
            "lodash": "~4.17.0"
        }
    }