Bugfixes

Added

• Add a new Job method called 'LimitRunsTo' (#67)

Changed

• rewriting scheduler logic (#54)
• regex for at time accepts time without leading zeros (#56)

Fixed

• Make sure Do() does not override the nextRun time when StartAt() is used (#49)
• scheduler schedules jobs registration when already running (#61)

Chores

• Add godoc badge to README (#51)
• removing legacy deterministic tests (#62)
• Add examples from README to example_test.go (#66)
• add go 1.15 to testing matrix and remove 1.13 (#68)