Updates based on SLEEF v2.110

v0.4.0

Rename Sleef.jl to SLEEF.jl

Updates based on SLEEF v2.100

v0.3.0

Update README

Updates based on SLEEF v2.90

v0.2.0

Updates and tweaks for SLEEF 2.9

Port based on SLEEF v2.80

v0.1.0

Update README.md