v0.4.0

• Fix error in formula used to define a cutoff value for the first sudden gains criteria based on the Reliable Change Index (RCI; Jacobson & Truax, 1991) in the function define_crit1_cutoff()
• Add formulas used to calculate standard error of measurement, standard error of difference, and relaible change value to help file of define_crit1_cutoff()
• Simplify define_crit1_cutoff() function arguments
• Add links to functions of other R packages to help files
• Add links to functions of suddengains package to help files
• Add option to not adjust critical value in third sudden gains criterion