beezdiscounting 0.3.0

New features

• Add functions for scoring 5.5 trial probability discounting task (from the Qualtrics template) including: calc_pd()
  (and score_pd(), timing_pd(), and ans_pd).

Minor fix

• Subsetting issue is fixed in score_dd() that would unintentionally drop all rows if both conditions were FALSE.

Other changes

• Rename example data from five.fivetrial to five.fivetrial_dd for delay discounting.

• Add example data five.fivetrial_pd for probability discounting.