0.2.0

• add expand function with until argument
• rename some C functions

0.1

Added functions:

• get_freq
• get_until
• get_untiltz
• get_count
• get_interval
• get_bysecond
• get_byminute
• get_byhour
• get_byday
• get_bymonthday
• get_byyearday
• get_byweekno
• get_bymonth
• get_bysetpos
• get_wkst

rename other functions