Added new command '/sähkö' which fetches and displays nordicpool electric price data for the current date.
Data for the date is visualized with ascii graph presentation
If next days price data is available it can be checked as well
Data for a date is cached when requested for the first time for a date. Old data is removed from the cache at every midnight
command '/sähkö' and all old basic commands with nordic characters are now matched with non-nordic characters as well. For example '/sahko', '/saa', '/kayttajat', '/saanto' will now trigger as those commands as well