Fixed links in plugins/README.md
Remove some trailing whitespace.
Basemap Kartverket

Plugin for color and grayscale topo tiles for Norway.

Based on OSM plugin.
Data from http://kartverket.no/en/
Added subdomains for the tile server for load balancing requests
Merge pull request #895 from sollie/kartverket

Basemap Kartverket
Merge pull request #880 from nexushoratio/whitespace

Remove some trailing whitespace.
Merge pull request #877 from Guria/patch-1

Fixed links in plugins/README.md