Added support for recurring items (not documented on readme/site/etc yet!)
r5 2016-10-07 =30d Elec Bill
r7 2016-12-08 =90d Water Bill
r2 2016-10-01 +1w Do a weekly thing, skipping ahead a week if late
r2 2016-10-01 =1w Do a thing
Rastodo will display the date the items should recur at the end of their description.
Support for bumping the date from to the next recurrence from the command line is planned for the next release.