Update Sweden/PostNord in Tracking

Update name, link to documentation and description of PostNord API. 

Name changed form Sweden to PostNord due to PostNord is a service provider for Sweden and Denmark. 
Description adding Denmark.
Change linked documentation from from specific to general API entry point.

README.md

@@ -1365,7 +1365,7 @@ API | Description | Auth | HTTPS | CORS |
 |---|---|---|---|---|
 | [Pixela](https://pixe.la) | API for recording and tracking habits or effort, routines | `X-Mashape-Key` | Yes | Yes |
 | [Postmon](http://postmon.com.br) | An API to query Brazilian ZIP codes and orders easily, quickly and free | No | No | Unknown |
-| [Sweden](https://developer.postnord.com/docs2) | Provides information about parcels in transport | `apiKey` | No | Unknown |
+| [PostNord](https://developer.postnord.com/api) | Provides information about parcels in transport for Sweden and Denmark | `apiKey` | No | Unknown |
 | [UPS](https://www.ups.com/upsdeveloperkit) | Shipment and Address information | `apiKey` | Yes | Unknown |
 | [WeCanTrack](https://docs.wecantrack.com) | Automatically place subids in affiliate links to attribute affiliate conversions to click data | `apiKey` | Yes | Yes |
 | [WhatPulse](https://whatpulse.org/pages/webapi/) | Small application that measures your keyboard/mouse usage | No | Yes | Unknown |