v4.0.0

Sundials v4.0.0

Diff since v3.9.0

Closed issues:

• Test failure in Jacobian test (#224)
• Update to Sundials 5 (#234)
• KLU not working (#236)
• Cannot build v3.7 in Julia 1.3 (#239)
• Fix KLU and sparse matrix support for Sundials 5 (#244)

Merged pull requests:

• [WIP] Update to Sundials 5 (#235) (@ChrisRackauckas)
• Update Sundials common interface (#245) (@YingboMa)
• CompatHelper: add new compat entry for "CEnum" at version "0.2" (#246) (@github-actions[bot])
• fix KLU and sparse matrix support (#248) (@ChrisRackauckas)