v2.1.3

SpecialFunctions v2.1.3

Diff since v2.1.2

Closed issues:

• Spherilcal Bessel and Hankel function (#108)
• gamma_inc_inv throws an DomainError for valid arguments (#385)
• Another gamma_inc_inv failure (#387)

Merged pull requests:

• Release 1.8 backports (#383) (@andreasnoack)
• Fix condition in __gamma_inc_inv to ensure that sqrt argument in (#386) (@andreasnoack)
• Avoid negative initial x0 in gamma_inc_inv_qsmall. When the initial (#388) (@andreasnoack)