shide 0.2.1

• Default formatting for jdatetime objects is changed to conform to default R behavior.

• jdate and jdatetime vectors are printed more nicely in tibbles.

• Rounding family of functions (sh_floor(), sh_ceiling() and sh_round()) now accept
  multi-unit values for unit argument.

• jdatetime() and jdatetime_make() now support ambiguous time resolution strategies
  via ambiguous argument (ambiguous times occur during a repeated interval when the clock
  is adjusted backwards during the transition from DST to standard time).

• Fixed a bug regarding casting of jdatetime to jdate (#4).