freegeoip.net API endpoint is deprecated and will stop working on July 1st, 2018

[shanness]

Hey there, not sure if you are still maintaining this, but looks like it's about to break!

Will require a API key and a new endpoint.

curl -s http://freegeoip.net/json/14.200.56.93
{"deprecation_message":"This API endpoint is deprecated and will stop working on July 1st, 2018. For more information please visit: https://github.com/apilayer/freegeoip#readme","ip":"14.200.56.93","country_code":"AU","country_name":"Australia","region_code":"NSW","region_name":"New South Wales","city":"Marrickville","zip_code":"2204","time_zone":"Australia/Sydney","latitude":-33.9032,"longitude":151.1518,"metro_code":0}

[shanness]

Changing the two lines in FreegeoipProvider.java from

  private static final String SERVICE_URL_INDEX = "http://freegeoip.net/json/";
  private static final String RESPONSE_NOT_FOUND = "not found";

To

    private static final String SERVICE_URL_INDEX = "https://freegeoip.app/json/";
    private static final String RESPONSE_NOT_FOUND = "404 page not found";

Fixes the problem, as freegeoip.net is now dead, and the .app is a great replacement (free and 15,000 requests per hour allowed with no account rego crap).

I've implemented as a custom provider (nice docs and interface on that!), to make us more agile in the future, but thought you might like to know this can be rescued easily :)

Cheers, and thanks for a very nicely written plugin!