Make version 2 API as default

[steffex]

Update in march when version 1 will be shutdown

[RoelAdriaans]

New key currently is an api 2 key, version 1 api is no longer available ..

{"message":"Version 1 of the Postcode API is not available anymore. More info: http://blog.apiwise.nl/van-postcode-api-1-0-naar-2-0/"} , see in Dutch http://blog.apiwise.nl/van-postcode-api-1-0-naar-2-0/

[steffex]

@RoelAdriaans-B-informed i've added a release to github. I'll add it to pypi later today

[steffex]

@RoelAdriaans-B-informed the package is updated on pypi! Sorry it took a while.