Registers a shortcode for fetching weather forecast from yr.no
weather-forecast-shortcodefolder to the
IMPORTANT: If upgrade to new version from 1.2 or earlier fails, rename the folder
wp-content/plugins/weather-forecast-shortcode to something else and reinstall the plugin.
This problem should never happen again. Then try setting permission for the old
cache subfolder to
755 and delete it through FTP. Otherwise try shell access or support may delete it.