v2.1.4

SpecialFunctions v2.1.4

Diff since v2.1.3

Closed issues:

• incomplete beta (beta_inc) function fails (#334)

Merged pull requests:

• Backport the gamma_inc_inv fixes (#389) (@andreasnoack)
• Fix a bug in coeff2 and add a test (#391) (@andreasnoack)
• Underflow without erroring in beta_inc (#392) (@andreasnoack)
• Avoid NaN in beta_inc_inv when p=q=1. (#393) (@andreasnoack)